Set symmetric difference by %20

N
:0
s/\<\(\w*\)\>\(.*\)\<\1\>/\2/
t0
s/$/@ abcdefghijklmnopqrstuvwxyz/
:
s/\<\(\(.\)\w*\)\s\+\(\(\w\)\w*\)\>\(.*@.*\4.*\2\)/\3 \1\5/
t
s/\<\(\(\w*\)\(\w\)\w*\) \(\2\(.\)\w*\)\(.*@.*\5.*\3\)/\4 \1\6/
t
s/@.*//

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

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