/a/{P;d}
s_.*[02468]$_WHITE_
/ /s_.*_BLACK_
G
x
1s_.*_Case #: 9)0123456789_
s_:_):_
:
s_\(.\))\(.*\1\()\?.\)\)_\3\2_
t
s_#)_#1_
x
1d
s/.* /&&/
D