1a 1a 1a 2s13 2s13 2s13 121s 121s 121s s31 s31 s31 a21 a21 a21 a1a a1a a1a 1s31 1s31 1s31 2a3 2a3 2a3 312 312 312 s3s1 s3s1 s3s1 as as as 2s2s 2s2s 2s2s