Features Form
1s→3
1s→3s
1s→3p
2s→3
2s→3s
2s→3p
1p→3
1p→3s
1p→3p
21→3
21→3s
21→3p
2p→3
2p→3s
2p→3p
3s→3'
3s→3's
3s→3'p
3p→3'
3p→3's
3p→3'p
X→3s
X→3p