Задача с использованием модуля itertools

import itertools
f = ['f' + str(i) for i in range(1, int(input())+1)]
s = ['s' + str(i) for i in range(1, int(input())+1)]
d = ['d' + str(i) for i in range(1, int(input())+1)]
a = f, s, d
 
two = []
for i in a:
    for j in i:
        two.append(j)
two_options = list(itertools.combinations(two, 2))
 
ff, ss, dd = [], [], []
for f1 in tuple(f):
    ff.append(f1)
for s1 in tuple(s):
    ss.append(s1)
for d1 in tuple(d):
    dd.append(d1)
elimination_f = list(itertools.permutations(ff,2))
elimination_s = list(itertools.permutations(ss,2))
elimination_d = list(itertools.permutations(dd,2))
 
two_options = [x for x in two_options if x not in elimination_f]
two_options = [x for x in two_options if x not in elimination_s]
two_options = [x for x in two_options if x not in elimination_d]
 
for i in two_options:
    for j in i:
        print(j, end=" ")
    print()
 
three_options = itertools.product(f, s, d)
for i in three_options:
    for j in i:
        print(j, end=' ')
    print()