# Aa a Aa 0.0 a 0-0-0 0:0N
N
a a.a a a, aN
a a_a.aN
N
N
a Aa(a.Aa):N
N
    a = [N
        ('a', '0_a_a_a'),N
    ]N
N
    a = [N
        a.AaAa(N
            a_a='a',N
            a='Aa',N
            a=a.AaAa(a=Aa, a=Aa),N
        ),N
        a.AaAa(N
            a_a='a',N
            a='Aa',N
            a=a_a.a.AaAa(a=Aa, a_a='Aa a a', a_a=0),N
        ),N
        a.AaAa(N
            a_a='a',N
            a='Aa',N
            a=a.AaAa(a=Aa, a_a=0, a=Aa),N
        ),N
    ]N
