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python permutations
import itertools r=0 rr=0 for pm in itertools.permutations([1,2,3,4,5,6,7,8]): if (pm[4]!=pm[5]-1):continue if (pm[6]!=pm[7]-1):continue if (pm[6]<5):continue if (pm[0]==8):continue if (pm[3]==1 or pm[4]==1):continue r+=1 if (pm[4]==4): rr+=1 print(r,r-rr)
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Problem: binary
Counter() in collections
Fold an array