Letters that make periodic sentence
s, o, d, e, n, p, c, r, t, i are letters that make 'periodic sentence'
Words within periodic sentence
ER, OD, sente, pe, period, te, NT, IC, sen, en, SE, RI, periodic, sent, ten, ic, CE, sentence, Rio, NC, Io, peri, Ce, Er, Se, Te are words within 'periodic sentence'