Divide the rectangle by emoken

s/^/ab\n/
s/.*/&&&&&&&&&&&&&&&/
s/$/acd\nacd\nacd\n/
s/$/efcd\n/
s/efcd./&&&&/
s/$/eghd\n/
s/$/egi\n/
s/egi./&&&&&&&&&/
s/[abe]/&&&&&&&&&&&&&&/g;s/a[^a]/aaaa&/g;s/[^b]b/&b/g
s/[cdgi]/&&&&&&&/g;s/g[^g]/ggg&/g;s/[^i]i/&ii/g;s/[^d]d/&d/g
s/f/&&&&/g
s/./ &/gm

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

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