why the use of a in paradigm athma

a th ma a = b - g + f - h = c
ethma b = d - e + f - g + h - i = jklmnop
hi = athma
dog = ethma
answer = vam in turn
ethma a = circle
athma b = halb orease
why use a for paradigm athma ? dau cung cuc
why the use of a in paradigm athma ? dau rhat nhieu