Divide the rectangle by flagitious

$_='%67s'%$/*c=?a
'\x12\x0f\x07\x08\x0e\x04
\x01\x09'.each_byte{|i|c+=1.upto(i*i){|j|$_[j%i*67-~~/  /]=c}}
print

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

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