Letters that make overrefinement
o, e, f, n, m, r, t, i, v are letters that make 'overrefinement'
Words within overrefinement
ER, refinement, re, OV, NT, men, ref, em, en, refine, fine, over, in, fin, IN, ME, NE, Re, Er, In, Ne, overrefine, err are words within 'overrefinement'