gistfile1.py

#!/usr/bin/env python

import sys
from collections import defaultdict

seen = defaultdict(list)

for lineNumber, line in enumerate(sys.stdin):
    if lineNumber:
        fields = line.split('|')
        key = '|'.join(fields[:2] + fields[3:])
        seen[key].append((lineNumber, fields[2]))

for key, whereSeen in seen.iteritems():
    if len(whereSeen) > 1:
        print key,
        for lineNumber, addressId in whereSeen:
            print '\t%d %s' % (lineNumber, addressId)