Letters that make subpopulation
s, a, o, b, l, n, p, t, i, u are letters that make 'subpopulation'
Words within subpopulation
sub, lat, la, ti, PO, pul, at, pula, pop, on, population, LA, Io, ion, Po, At, La, Pu, Ti are words within 'subpopulation'