Y by pla

:%s/$/_
vgggJ:s/[^Y]/_/g
:s/./&\x16\x0d/g
ggA 0\x1bqavF yjp\x01q999@a:g/^[^Y]/d
\x16gglxZZ

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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