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Japt -h, 7 bytes à ñÊkøV Try it à ñÊkøV :Implicit input of strings U=X & V=Y à :Powerset of U ñ :Sort by Ê : Length k :Remove elements that...
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#1: Initial revision
# [Japt](https://github.com/ETHproductions/japt) [`-h`](https://codegolf.meta.stackexchange.com/a/14339/), 7 [bytes](https://en.wikipedia.org/wiki/ISO/IEC_8859-1) à ñÊkøV [Try it](https://petershaggynoble.github.io/Japt-Interpreter/?v=1.4.6&flags=LWg&code=4CDxymv4Vg&input=ImhvbW9sb2d5IgoibyI) à ñÊkøV :Implicit input of strings U=X & V=Y à :Powerset of U ñ :Sort by Ê : Length k :Remove elements that øV : Contain V :Implicit output of last element