d = {} d['1'] = 'a' d['2'] = 'b' d['4'] = 'a' #create dict for a. given the source, we get the destination # when we are at a, we would know where we started from. # using the source, we can determine the destination d['a'] = { '1' : 'L', '4' : 'S' } print d['a']['1']
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