Letters that make out-of-the-box thinking
o, b, e, f, g, k, n, h, t, i, u, x are letters that make 'out-of-the-box thinking'
Words within out-of-the-box thinking
king, ink, thinking, think, hi, he, kin, ox, He, King, hin, ng, ki, ut, thin, out, in, box, HI, IN, Ki, In, Th, UT are words within 'out-of-the-box thinking'