pnm - pnm decoding and encoding


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P1 20 15
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 0 0 0 1 0 1 0 0 0 0 0 1 0 0 0 0 1 1 
1 1 1 0 1 1 1 1 0 1 0 1 0 1 0 1 1 0 1 1 
1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 1 1 0 1 1 
1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 1 1 0 1 1 
1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 0 0 0 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1