persondic={1:'a',2:'b',3:'c'}
counts={}
lst=[[1,2,3],[3,2,1],[1,3,2],[1,2,3]]
for i in lst:
ckey=persondic[i[0]]
counts[ckey]=counts.get(ckey,0)+1
for v in persondic.values():
print v,'=',counts.get(v,0)
python2.7
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