Letters that make exponential series
s, a, o, e, l, n, p, r, t, i, x are letters that make 'exponential series'
Words within exponential series
ER, series, IE, ti, pone, NT, PO, expo, en, SE, RI, ex, one, on, exponential, ie, AL, IA, NE, Erie, Po, exponent, TIA, Al, Es, Er, Ne, Se, Ti are words within 'exponential series'