Certain shortened forms of pronouns are possible only in A/S or P position.
1SG:
A/S: beta, bet, be
P: beta
2SG:
A/S: ose, os, se, ale, al
P: ose, os, se, ale
3SG:
A/S: dia, di, de
P: dia
3SG.N:
A/S: akang
P: akang, kang, ang
1PL:
A/S: katong, tong
P: katong
Source: Scott 2008: 397