('CID100010101', 1),WLN: T6NTJ A1 BV2 DR CQ
('CID100070312', 1),WLN: QR DQ BV2
ldiff: defaultdict(<type 'list'>, {'CID100010101': [20], 'CID100070312': [11]})
f1: [20]
f2: [11]
c1: Counter({20: 1})
c2: Counter({11: 1})
The chosen was  ... CID100070312