Letters that make self-defeating
s, a, d, e, f, g, l, n, t, i are letters that make 'self-defeating'
Words within self-defeating
el, LF, ti, ting, defeat, ELF, at, ng, SE, Ea, EL, self, in, feat, eating, tin, DE, IN, elf, At, In, Fe, Se, Ti, eat are words within 'self-defeating'