diff --git a/HowManyThatDigitFromXtoY/README for HowManyThatDigitFromXtoY b/HowManyThatDigitFromXtoY/README.md
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rename from HowManyThatDigitFromXtoY/README for HowManyThatDigitFromXtoY
rename to HowManyThatDigitFromXtoY/README.md