relationship.py

#!/usr/bin/env python3
import itertools
import sys

users = [x.rstrip() for x in sys.stdin.readlines()]

result = "(" + " OR ".join(map(lambda x: "from:" + x, users)) + " exclude:replies) OR "

pairs = []

for (x, y) in itertools.permutations(users, 2):
    pairs.append("(from:{} to:{})".format(x, y))

result += " OR ".join(pairs)
print(result)