lista = []
basta = "basta"
c = 1
i = 0
while c>0:
parola = input("Inserisci una parola")
if parola == basta:
c = c + 1
else:
len = len(parola)
while len>i:
if parola != lista[i]:
lista.append(parola)
i = i + 1
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