mix lines by KirarinSnow

H
$!d
G
y/\n/:/
s/.*::/\n:/
:
s/\(\n[^:]*\):\(.\)/\2\1</
s/<</</
s/<$//
t
y/</:/
/\n./b

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

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