def get_repeating_DNA(dna):
    stored_dnas = []
    dna_lenght = len(dna)
    for i in range(0, dna_lenght, 1):
        test_dna = dna[i: i + 10]
        if test_dna in dna[i + 10:]:
            if test_dna not in stored_dnas and len(test_dna) > 9:
                stored_dnas.append(test_dna)
        elif test_dna in dna[i + 1: i + 11]:
            if test_dna not in stored_dnas and len(test_dna) > 9:
                stored_dnas.append(test_dna)
    return stored_dnas

test = "AAAAAAAAAAA"
result = get_repeating_DNA(test)
print(result)