Letters that make parenthesis
s, a, e, n, p, h, r, t, i are letters that make 'parenthesis'
Words within parenthesis
PA, thesis, he, re, si, NT, He, are, ar, Pa, en, par, SI, pare, sis, nth, parent, rent, AR, Re, pa, Ar, Es, Si, Th are words within 'parenthesis'