Korean “-(으)ㅁ에 틀림없다” expresses an almost unreserved conclusion based on the available evidence or information. It is commonly translated as “must be…,” “there is no doubt that…” or “without question….” Its tone is more certain than “것 같다” or “나 보다,” but it is still the speaker’s inference rather than a formally verified fact.

When reading news commentary or analytical reports, this pattern often appears at the end of an argument. The preceding sentences present figures, behaviour or results, and “-(으)ㅁ에 틀림없다” then turns them into a clear conclusion. Using it on the basis of only a vague impression can sound excessively assertive. When something has already been officially confirmed, stating the fact directly is usually clearer.

What Does Korean “-(으)ㅁ에 틀림없다” Mean? A Highly Certain Judgment and Its Conditions of Use

“틀림없다” originally means that there is no mistake or error. When it follows the nominalizing form “-(으)ㅁ” and the particle “에,” the entire construction can be understood as “there can be no mistake concerning the preceding statement.”

For example, “그는 전문가임에 틀림없다” does not simply mean that someone seems like an expert. Based on the person’s explanation, experience or performance, the speaker concludes that the person must have professional expertise. It is still an inference, but the speaker’s level of certainty is very high.

Korean “-(으)ㅁ에 틀림없다” Conjugation Rules: Verbs, Adjectives and Nouns

“-(으)ㅁ에 틀림없다” first nominalizes a complete statement and then attaches “에 틀림없다.” Verb and adjective stems ending in a final consonant generally take “-음,” while stems without a final consonant take “-ㅁ.” Nouns change “이다” to “임.”

Tense must also appear before “-(으)ㅁ.” Events that have already occurred commonly use “-았／었음에 틀림없다.” An ongoing state can use “-고 있음에 틀림없다,” while a future judgment commonly takes “-(으)ㄹ 것임에 틀림없다.”

Type of Preceding Element	Conjugation Pattern	Example	Meaning
Verb stem ending in a final consonant	Stem＋음에 틀림없다	먹음에 틀림없다	Must have eaten
Verb stem without a final consonant	Stem＋ㅁ에 틀림없다	감에 틀림없다	Must go／certainly goes
Past action	-았／었음에 틀림없다	준비했음에 틀림없다	Must have prepared
Ongoing state	-고 있음에 틀림없다	기다리고 있음에 틀림없다	Must be waiting
Adjective	-(으)ㅁ에 틀림없다	중요함에 틀림없다	Must be important
Noun＋이다	Noun＋임에 틀림없다	전문가임에 틀림없다	Must be an expert
Past nominal judgment	Noun＋이었／였음에 틀림없다	전환점이었음에 틀림없다	Must have been a turning point
Negative verb	-지 않았음에 틀림없다	오지 않았음에 틀림없다	Must not have come
Negative noun	Noun＋이／가 아님에 틀림없다	사실이 아님에 틀림없다	Must not be true
Future judgment	-(으)ㄹ 것임에 틀림없다	도움이 될 것임에 틀림없다	Will undoubtedly be helpful

Three Core Uses of Korean “-(으)ㅁ에 틀림없다”: Inference, Evaluation and Formal Conclusions

Use ① of “-(으)ㅁ에 틀림없다”｜Inferring a Past Event from a Present Result

“-(으)ㅁ에 틀림없다” is frequently used to infer what happened in the past from a result that can currently be observed. The speaker did not witness the entire process, but physical traces, completed work or relevant records all point toward the same answer.

These sentences commonly use the past nominalized form “-았／었음에 틀림없다.” Adding expressions such as “것으로 보아,” “기록을 보면” or “결과를 보면” to identify the basis of the inference makes the sentence more complete.

Example: 발표가 이렇게 매끄러운 걸 보니 오랫동안 준비했음에 틀림없어요.
Romanization: bal-pyo-ga i-reo-ke mae-kkeu-reo-un geol bo-ni o-raet-dong-an jun-bi-hae-sseum-e teul-lim-eop-sseo-yo.
Translation: Judging from how smoothly the presentation went, they must have prepared for a long time.
The quality of the presentation is the visible clue, while the preparation process is inferred from that result.
Example: 도로 곳곳에 물이 고여 있는 것으로 보아 밤새 비가 많이 왔음에 틀림없습니다.
Romanization: do-ro got-got-e mul-i go-yeo in-neun geo-seu-ro bo-a bam-sae bi-ga ma-ni wa-sseum-e teul-lim-eop-seum-ni-da.
Translation: Judging from the water pooled throughout the roads, it must have rained heavily overnight.
The standing water provides specific evidence, making the judgment better supported than a guess based only on cloudy weather.
Example: 문서의 표현이 일정한 것을 보면 여러 차례 검토되었음에 틀림없습니다.
Romanization: mun-seo-ui pyo-hyeon-i il-jeong-han geo-seul bo-myeon yeo-reo cha-rye geom-to-doe-eo-sseum-e teul-lim-eop-seum-ni-da.
Translation: Judging from the consistency of the wording, the document must have been reviewed several times.
The speaker does not know the exact number of reviews directly, but makes a highly certain inference from the document’s level of completion.

Use ② of “-(으)ㅁ에 틀림없다”｜Judging a Person’s Identity, an Object’s Nature or an Event’s Significance

When a noun is followed by “임에 틀림없다,” the construction often evaluates a person’s identity, the position of a work or the significance of an event within a broader development.

This type of statement is evaluative. Even when the wording is extremely confident, it does not necessarily mean that the identity or value has been officially recognized. The judgment should be based on a résumé, performance, influence or observable characteristics.

Example: 이 정도의 분석을 해낸 사람이라면 해당 분야의 전문가임에 틀림없습니다.
Romanization: i jeong-do-ui bun-seok-eul hae-naen sa-ram-i-ra-myeon hae-dang bun-ya-ui jeon-mun-ga-im-e teul-lim-eop-seum-ni-da.
Translation: Anyone capable of producing this level of analysis must be an expert in the field.
The depth and quality of the analysis provide the basis for judging the person’s professional expertise rather than relying on a first impression.
Example: 이 작품은 작가의 후기 활동을 이해하는 데 중요한 대표작임에 틀림없습니다.
Romanization: i jak-pum-eun jak-ga-ui hu-gi hwal-dong-eul i-hae-ha-neun de jung-yo-han dae-pyo-jak-im-e teul-lim-eop-seum-ni-da.
Translation: This work is undoubtedly an important representative piece for understanding the artist’s later career.
This is an evaluative statement that strongly affirms the work’s place within the artist’s creative development.
Example: 그 결정은 회사의 방향을 바꾼 중요한 전환점이었음에 틀림없습니다.
Romanization: geu gyeol-jeong-eun hoe-sa-ui bang-hyang-eul ba-kkun jung-yo-han jeon-hwan-jeom-i-eo-sseum-e teul-lim-eop-seum-ni-da.
Translation: That decision was undoubtedly an important turning point that changed the company’s direction.
Later developments make it possible to reassess the decision’s influence, so the expression is suitable for retrospective analysis.

Use ③ of “-(으)ㅁ에 틀림없다”｜Concluding an Inference in a Report or Commentary

Reports, reviews and formal analyses often present evidence first and then use “-(으)ㅁ에 틀림없다” to conclude the judgment. The expression gives a paragraph a strong sense of closure, so it should not be repeated in every sentence.

Adding “틀림없다” at the end does not make an argument reliable when no evidence has been provided beforehand. The pattern requires support from earlier figures, events or observations.

Example: 조사 결과를 종합하면 초기 대응이 피해를 줄이는 데 큰 역할을 했음에 틀림없습니다.
Romanization: jo-sa gyeol-gwa-reul jong-hap-ha-myeon cho-gi dae-eung-i pi-hae-reul ju-ri-neun de keun yeok-hal-eul hae-sseum-e teul-lim-eop-seum-ni-da.
Translation: Taken together, the investigation results leave no doubt that the initial response played a major role in reducing the damage.
“조사 결과를 종합하면” first identifies the basis of the judgment, and the second clause concludes the analysis with a high degree of certainty.
Example: 여러 기록을 보면 이 제도가 당시 사회에 큰 영향을 미쳤음에 틀림없습니다.
Romanization: yeo-reo gi-rok-eul bo-myeon i je-do-ga dang-si sa-hoe-e keun yeong-hyang-eul mi-chyeo-sseum-e teul-lim-eop-seum-ni-da.
Translation: Judging from the various records, this system must have had a major influence on society at the time.
Multiple records point toward the same conclusion, satisfying the requirement that “-(으)ㅁ에 틀림없다” be supported by substantial evidence.
Example: 반복된 오류는 기존의 검토 절차가 제대로 작동하지 않았음에 틀림없음을 보여 줍니다.
Romanization: ban-bok-doen o-ryu-neun gi-jon-ui geom-to jeol-cha-ga je-dae-ro jak-dong-ha-ji an-a-sseum-e teul-lim-eop-seu-meul bo-yeo jum-ni-da.
Translation: The repeated errors show that the existing review procedure must not have been functioning properly.
This is a report-style construction in which the highly certain conclusion is nominalized again and used as the object of “보여 주다.”

What Is the Difference Between “-(으)ㅁ에 틀림없다,” “것 같다,” “나 보다” and “모양이다”?

All of these patterns can express conjecture. The differences lie in how much uncertainty the speaker retains and whether the judgment is mainly based on an impression, immediate evidence or a complete body of information.

Point of Comparison	-(으)ㄴ／는 것 같다	-나 보다	모양이다	-겠-	것이／게 틀림없다	-(으)ㅁ에 틀림없다
Degree of certainty	Low to medium	Medium	Medium	Depends on context	High	Very high
Main basis	Personal impression or initial observation	Immediate visible evidence	External circumstances or results	Immediate judgment or prediction	Clear evidence	Data, context or formal analysis
Register	Everyday and widely used	Conversational	Neutral to written	Both everyday and formal	Both conversational and written	Formal and written
Room for uncertainty	Large	Some remains	Some remains	Depends on context	Small	Very small
Common form	비가 오는 것 같다	비가 왔나 보다	비가 온 모양이다	비가 오겠다	비가 온 게 틀림없다	비가 왔음에 틀림없다
Suitable context	Initial guess	Reaction after seeing evidence	Describing an observed result	Prediction or exclamation	Strong conversational judgment	Reports, commentary and analysis
Unsuitable context	A clear conclusion is required	No evidence at all	An officially confirmed fact	The meaning may be ambiguous	Evidence is weak	Casual conversation or insufficient evidence

“것 같다”: Retaining the Most Uncertainty When the Evidence Is Incomplete

“것 같다” indicates only that something appears or feels likely. It is the most natural choice when the evidence is incomplete or the speaker does not want to sound too certain.

Example: 밖에 비가 오는 것 같아요.
Romanization: bak-kke bi-ga o-neun geot ga-ta-yo.
Translation: It seems to be raining outside.
The speaker may have only heard the sound of rain or noticed the sky becoming dark and still leaves room for uncertainty.

“나 보다”: An Immediate Inference Made After Seeing Evidence

“나 보다” commonly appears as an immediate reaction to an observed result. Its tone is closer to “it looks as though…” than “것 같다.”

Example: 길이 젖어 있는 걸 보니 비가 왔나 봐요.
Romanization: gil-i jeo-jeo in-neun geol bo-ni bi-ga wan-na bwa-yo.
Translation: The road is wet, so it looks like it rained earlier.
The wet road is the basis of the inference, but other causes such as street cleaning remain possible.

“모양이다”: An Inference Organized from External Circumstances

“모양이다” also expresses a judgment based on evidence. Its tone is slightly calmer than “나 보다” and can be used in descriptive writing.

Example: 사람들이 우산을 들고 있는 것을 보니 비가 오는 모양입니다.
Romanization: sa-ram-deu-ri u-san-eul deul-go in-neun geo-seul bo-ni bi-ga o-neun mo-yang-im-ni-da.
Translation: Seeing everyone carrying umbrellas, it appears to be raining.
The speaker infers the weather from the behaviour of the people nearby but does not present the inference as a confirmed fact.

“게 틀림없다”: High Certainty in a More Conversational Form

“것이 틀림없다” and its shortened form “게 틀림없다” also express high certainty. By comparison, “-(으)ㅁ에 틀림없다” is more condensed and sounds more like a formal written conclusion.

Example: 불이 모두 꺼진 걸 보니 벌써 퇴근한 게 틀림없어요.
Romanization: bu-ri mo-du kkeo-jin geol bo-ni beol-sseo toe-geun-han ge teul-lim-eop-sseo-yo.
Translation: All the lights are off, so they must have already left work.
“게 틀림없다” is suitable for ordinary conversation. It is strong, but not as formal as “퇴근했음에 틀림없다.”
Example: 출입 기록을 보면 이미 퇴근했음에 틀림없습니다.
Romanization: chu-rip gi-rok-eul bo-myeon i-mi toe-geun-hae-sseum-e teul-lim-eop-seum-ni-da.
Translation: According to the entry and exit records, they must have already left work.
The access records provide more complete evidence, and the sentence adopts a formal analytical tone.

When Something Has Been Officially Confirmed, State the Fact Directly Rather Than Using 틀림없다

“-(으)ㅁ에 틀림없다” is an inferential construction. When an official announcement, test result or complete record has already confirmed the information, a direct declarative sentence is usually more accurate.

△ 공식 발표에 따르면 행사가 취소되었음에 틀림없습니다.
According to the official announcement, the event must have been cancelled.
✅ 공식 발표에 따르면 행사가 취소되었습니다.
According to the official announcement, the event has been cancelled.
The official announcement already establishes the fact, so there is no need to turn confirmed information back into an inference. The second sentence states the result directly.

What Is the Difference Between “-(으)ㅁ에 틀림없다” and “게 틀림없다”? Written and Conversational Forms Compared

Both forms express a high degree of certainty. Their main differences lie in sentence structure and register.

“것이 틀림없다” uses “것” to receive an entire statement and is frequently shortened to “게 틀림없다” in conversation. “-(으)ㅁ에 틀림없다” directly nominalizes the preceding clause with “-(으)ㅁ,” creating a more concise tone that is common in analysis, commentary and formal writing.

Point of Comparison	것이／게 틀림없다	-(으)ㅁ에 틀림없다
Basic meaning	Must be, certainly	Without doubt, undoubtedly
Structure	Complete statement＋것이／게	Complete statement＋-(으)ㅁ에
Register	Both conversational and written	Formal and written
Naturalness in conversation	High	Lower
Sense of conclusion in reports	Medium	Strong
Example	준비한 게 틀림없다	준비했음에 틀림없다

“게 틀림없다” Is More Natural in Everyday Conversation

△ 민수는 벌써 집에 갔음에 틀림없어.
✅ 민수는 벌써 집에 간 게 틀림없어.
Minsu must have already gone home.
Both sentences are grammatically understandable, but “간 게 틀림없어” sounds more natural between friends. “갔음에 틀림없어” has a written analytical tone that does not fit a casual setting well.

“-(으)ㅁ에 틀림없다” Creates a Stronger Conclusion in Formal Analysis

Example: 이 자료가 당시의 상황을 이해하는 데 중요한 근거임에 틀림없습니다.
Romanization: i ja-ryo-ga dang-si-ui sang-hwang-eul i-hae-ha-neun de jung-yo-han geun-geo-im-e teul-lim-eop-seum-ni-da.
Translation: This material is undoubtedly important evidence for understanding the circumstances at the time.
“근거임에 틀림없습니다” is suitable as the concluding sentence of a report or historical analysis.

What Is the Difference Between 틀림없다, 분명하다 and 확실하다? Nuance and Usage Compared

“분명하다” and “확실하다” can both express clarity or certainty, but they are not used only for inference.

“분명하다” emphasizes that a situation or judgment is clear. “확실하다” emphasizes that something is reliable or confirmed. “틀림없다” carries the assertive sense that there can be no mistake.

Expression	Main Nuance	Is It Always an Inference?	Example
분명하다	Clear, explicit	No	목적이 분명하다
확실하다	Certain, reliable	No	신원이 확실하다
틀림없다	There can be no mistake; must be	Often involves judgment	범인인 게 틀림없다
-(으)ㅁ에 틀림없다	Formally concludes a highly certain judgment	Yes	범인임에 틀림없다

Example: 이번 조사의 목적은 분명합니다.
Romanization: i-beon jo-sa-ui mok-jeok-eun bun-myeong-ham-ni-da.
Translation: The purpose of this investigation is clear.
This sentence merely says that the purpose is clear and does not make an inference.
Example: 신원이 확실한 사람만 출입할 수 있습니다.
Romanization: sin-won-i hwak-sil-han sa-ram-man chu-rip-hal su it-seum-ni-da.
Translation: Only people whose identity has been verified may enter.
“확실하다” emphasizes that the identity information is reliable rather than inferring unknown information.
Example: 여러 정황을 보면 내부자가 정보를 유출했음에 틀림없습니다.
Romanization: yeo-reo jeong-hwang-eul bo-myeon nae-bu-ja-ga jeong-bo-reul yu-chul-hae-sseum-e teul-lim-eop-seum-ni-da.
Translation: Considering the various circumstances, an insider must have leaked the information.
The sentence makes a strong inference from the available evidence but does not mean that a judicial or formal investigation has been completed.

Three Common Mistakes When Using “-(으)ㅁ에 틀림없다”: Evidence, Rumours and Subjective Evaluations

When the Evidence Is Insufficient, Use “것 같다” to Preserve Uncertainty

❌ 얼굴이 낯익으니 유명한 사람임에 틀림없습니다.
The face looks familiar, so the person must be famous.
✅ 얼굴이 낯익은 걸 보니 유명한 사람인 것 같습니다.
The face looks familiar, so the person seems to be famous.
A vague impression that someone looks familiar is not sufficient to support “임에 틀림없다.” Using “것 같다” to leave room for uncertainty is more reasonable.

Unverified Rumours Should Not Be Asserted with 틀림없다

❌ 아직 확인되지 않았지만 그 소문은 사실임에 틀림없습니다.
Although it has not been confirmed, the rumour must be true.
✅ 아직 확인되지 않았으므로 사실이라고 단정하기 어렵습니다.
Because it has not yet been confirmed, it is difficult to conclude that it is true.
“Not yet confirmed” and “must unquestionably be true” contradict each other. Without sufficient evidence, a formal construction should not be used to disguise a rumour as a conclusion.

Subjective Preferences Do Not Need to Be Presented as Objective Conclusions with 틀림없다

△ 이 영화는 최고의 작품임에 틀림없습니다.
This film is undoubtedly the greatest work.
✅ 이 영화는 올해 가장 인상 깊게 본 작품 중 하나입니다.
This film is one of the most memorable works I have seen this year.
“Best work” involves subjective evaluation. If the article has not first established clear criteria, using “임에 틀림없다” may sound excessively assertive.

Written Contexts for “-(으)ㅁ에 틀림없다”: Reports, Commentary and Editorial Judgment

Formal Korean writing often uses “-(으)ㅁ” to turn a complete statement into a nominal unit before adding a judgment, confirmation or evaluation. This structure allows preceding information to be condensed into a clear conclusion, but it also makes the sentence sound more written.

“-(으)ㅁ에 틀림없다” is common in editorials, reports, historical analyses and reviews of creative works. When information in breaking news has not yet been confirmed, writers usually use more reserved forms such as “것으로 보인다,” “가능성이 있다” or “추정된다” to avoid presenting conjecture as fact.

Situation ①｜Evaluating an Event Based on Satisfaction and Willingness to Participate Again

A: 참가자 만족도와 재참여 의사가 모두 높게 나왔습니다.
　　cham-ga-ja man-jok-do-wa jae-cham-yeo ui-sa-ga mo-du nop-ge na-wa-sseum-ni-da.
　　Both participant satisfaction and willingness to participate again were high.

B: 이 결과를 보면 이번 행사가 성공적이었음에 틀림없습니다.
　　i gyeol-gwa-reul bo-myeon i-beon haeng-sa-ga seong-gong-jeok-i-eo-sseum-e teul-lim-eop-seum-ni-da.
　　Judging from these results, the event must have been successful.

📌 Grammar point: Satisfaction and willingness to participate again provide two specific pieces of evidence, allowing the second sentence to conclude the evaluation with a high degree of certainty.

Situation ②｜How an Editor Reduces the Strength of an Assertion When Information Is Unconfirmed

A: 그 소문이 사실임에 틀림없다고 써도 될까요?
　　geu so-mun-i sa-sil-im-e teul-lim-eop-tta-go sseo-do doel-kka-yo?
　　Can we write that the rumour must be true?

B: 아직 공식 확인이 없으니 가능성이 있다고만 쓰는 게 좋겠습니다.
　　a-jik gong-sik hwak-in-i eop-seu-ni ga-neung-seong-i it-tta-go-man sseu-neun ge jo-ket-seum-ni-da.
　　There has been no official confirmation yet, so it would be better to write only that it is a possibility.

📌 Grammar point: When information has not been officially confirmed, “임에 틀림없다” is too assertive. “가능성이 있다” more accurately reflects the available evidence.

Situation ③｜Evaluating a Work as a Turning Point in an Artist’s Career

A: 이 작품이 왜 그렇게 중요하게 평가됩니까?
　　i jak-pum-i wae geu-reo-ke jung-yo-ha-ge pyeong-ga-doem-ni-kka?
　　Why is this work considered so important?

B: 이후 작품의 주제와 형식에 큰 영향을 준 전환점이었음에 틀림없기 때문입니다.
　　i-hu jak-pum-ui ju-je-wa hyeong-sik-e keun yeong-hyang-eul jun jeon-hwan-jeom-i-eo-sseum-e teul-lim-eop-kki ttae-mun-im-ni-da.
　　Because it was undoubtedly a turning point that had a major influence on the themes and forms of the artist’s later works.

📌 Grammar point: Later works demonstrate a clear change, allowing a highly certain evaluation to be made from the broader creative context.

Cultural Notes:

Formal Korean frequently uses “-(으)ㅁ” to nominalize complete sentences, as in “필요함을 확인했다” and “문제가 있음을 인정했다.” This construction allows an event or judgment to be treated as an item in a report and sounds more concise than “것.”
Although “틀림없습니다” uses a polite sentence ending, the strength of the assertion is not reduced. When speaking to customers, elders or a public audience, the speaker must still confirm that the evidence is sufficient.
Conjecture in public information is often presented in degrees. “것 같다” retains the most uncertainty, “가능성이 있다” indicates that a possibility exists, “추정된다” presents an inference based on data, and “틀림없다” approaches a judgment that rejects other explanations.

How Does Korean “-(으)ㅁ에 틀림없다” Compare with Japanese “〜に違いない”?

Japanese “〜に違いない” also expresses a highly certain inference based on evidence and is commonly translated as “must be…” or “certainly….”

The main differences lie in conjugation and register. Japanese “〜に違いない” attaches directly to the plain form of a verb, adjective or noun and can be used in both everyday conversation and writing. Korean “-(으)ㅁ에 틀림없다” requires nominalization with “-(으)ㅁ” and has a stronger formal written tone. In everyday Korean, “-(으)ㄴ／는 게 틀림없다” is closer to the ordinary conversational use of Japanese “〜に違いない.”

Example: 彼は長い間、準備してきたに違いありません。
Kana: かれはながいあいだ、じゅんびしてきたにちがいありません。
Translation: He must have been preparing for a long time.
Japanese attaches “に違いない” directly to the plain form “準備してきた” without additional nominalization.
Example: あの方はこの分野の専門家に違いありません。
Kana: あのかたはこのぶんやのせんもんかにちがいありません。
Translation: That person must be an expert in this field.
A Japanese noun can attach directly to “に違いない,” making the form shorter than the Korean construction.
Example: 道路に水がたまっているところを見ると、昨夜は大雨が降ったに違いありません。
Kana: どうろにみずがたまっているところをみると、さくやはおおあめがふったにちがいありません。
Translation: Judging from the water pooled on the roads, it must have rained heavily last night.
Japanese “〜に違いない” likewise requires observable evidence. Without it, the expression may sound excessively assertive.
◆ Core difference from “〜に違いない”:
The two patterns express similar levels of certainty, and neither means that the information has been officially confirmed. Korean “-(으)ㅁ에 틀림없다” sounds more like a formal conclusion in a report or commentary. Japanese “〜に違いない” is also common in ordinary conversation. In conversational Korean, “게 틀림없다” can preserve the same degree of certainty more naturally.

Korean “-(으)ㅁ에 틀림없다” is appropriate when the evidence is already fairly complete but the speaker still needs to present the conclusion as an inference. It is more certain than “것 같다” and “나 보다,” and more formal than “게 틀림없다.”

Before using it, check two things: whether the content is a confirmed fact or an inference drawn from data, and whether the available evidence is sufficient to eliminate most alternative possibilities. State confirmed information directly and use a more reserved form when the evidence remains weak. Only when both the data and the context point toward the same answer does the force of “-(으)ㅁ에 틀림없다” sound proportionate.

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