Short 'U'

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IBBOTXMEN CTXKHRPBP FZLSSUNHC LNUOBBEJU RUNKUPIAT JDHLTVMJH UCPUBWJUM UFUPQLUMR CYUSIXBOE
1.
CUT
2.
BUT
3.
RUN
4.
UP
5.
US
6.
SUN