Letters that make operation code
a, o, d, e, n, p, c, r, t, i are letters that make 'operation code'
Words within operation code
cod, ER, opera, OD, COD, code, ode, Opera, pe, ti, ERA, ration, at, ratio, on, operation, rat, RA, CO, DE, Io, ion, Ra, At, Co, Er, Ti, era are words within 'operation code'