Letters that make proportional sample
s, a, o, e, l, n, p, m, r, t, i are letters that make 'proportional sample'
Words within proportional sample
proportional, OR, SAM, proportion, sample, AM, ti, PR, PO, MP, SA, Ro, amp, ample, on, pro, port, portion, prop, AL, Io, ion, Po, LE, Al, Am, Pr, Na, Ti, AMP are words within 'proportional sample'