differentiation by xsot

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

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

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