pda 46.0 131.0 280.0 131.0 451.0 132.0 558.0 132.0 1 1 a a aa 1 1 b b bb 1 1 a b ab 0 1 b z bz 0 1 a z az 1 2 a a 1 2 b b 2 3 z z 1 1 b a ba