Letters that make thing-in-itself
s, e, f, g, l, n, h, t, i are letters that make 'thing-in-itself'
Words within thing-in-itself
el, LF, IT, hi, ELF, hin, ng, SE, EL, thin, self, in, thing, HI, IN, elf, In, Se, Th are words within 'thing-in-itself'