Knight move sorted by mitchs

s/./\x09&!!12345678!!abcdefgh!!/g
:
s/\x09\(.\)\S*\(..\)\1\(..\)\S*/\2!\3/
s/\(\S\)\(\S*\)\(.\)\(.\)!\(.\)\(.\)$/\1\4 \1\5 \2\4\3!\6\5/
t
s/\S*!\S*.//g
L
d

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

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