Double even indexed characters by %20

9 8 7 6 5 4 3 2 1
9
a b b
b b
a
8 7 6 5 4 3 2 1
a a
a
9 8 7 6 5 4 3 2 1
9

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

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