differentiation by hallvabo (xsot)

import re,os
for(s,n,k)in re.findall('(\D*)(\d*)x(\^.)?',os.read(0,9**9)):p=hash(k)%5;os.write(1,s+`int(n)*-~p`+("x^%d"%p)[:p*p])

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

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