Please see also the guidance on learning the pronominal prefixes.
1=first person, I; 2=second person, you; 3=third person, he/she/it;
m=minimal, ua=unit augmented, a=augmented. sg=singular, du=dual, pl=plural.
1m=I, 1ua=I+1 (I and one more, excluding hearer), 1a=we (excluding hearer).
12m=I+you, 12ua=I+you+1 (I and you and one more) 12a=we (including hearer).
2m=you, 2ua=you+1, 2a=you all
3m=he/she/it, 3ua=he/she/it+1, 3a=they