>>> from memory import Memory

>>> m = Memory(4, 6)
>>> m.omplir('ABCCAH', 0)
>>> m.omplir('BADAEC', 1)
>>> m.omplir('HDCFFE', 2)
>>> m.omplir('FGAAGF', 3)
>>> for f in range(4):   # Dibuixem l'espai de joc (les cartes)
...    for c in range(6):
...       print(m[f,c], end='')
...    print()
ABCCAH
BADAEC
HDCFFE
FGAAGF
>>> it = m.parelles('B')
>>> for pos in it:
...      print(pos, end='-')
(0, 1)-(1, 0)-
>>> next(it, -1)  # Comprovem que l'iterador s'ha exhaurit
-1
>>> for pos in m.parelles('F'):
...      print(pos, end='-')
(2, 3)-(2, 4)-(3, 0)-(3, 5)-

--fi-enunciat