Polia

# -*- coding: utf-8 -*-

pole = [2, 6, 7, 5, 4, 7, 8, 3, 1, 5, 9, 1]

n = len(pole)

pocet = 0

for i in range(n):

    for j in range(i+1, n):

        if pole[i] == pole[j]:

            pocet += 1

print(f"Pocet dvojic je {pocet}")