a-a aaa aag aan aao aap ag- aga agg agn ago agp an- ana ang ann ano anp aoa aog aon aoo aop ap- apa apg apn apo app g-p gaa gag gan gao gap gga ggg ggn ggo ggp gna gnn gno gnp goa gog gon goo gop gpa gpg gpn gpo gpp naa nag nan nao nap nga ngg ngn ngo ngp nna nng nnn nno nnp no- noa nog non noo nop npa npg npn npo npp oaa oag oan oao oap oga ogg ogn ogo ogp on- ona ong onn ono onp oo- ooa oog oon ooo oop op- opa opg opn opo opp p-p paa pag pan pao pap pga pgg pgn pgo pgp pn- pna png pnn pno pnp poa pog pon poo pop ppa ppg ppn ppo ppp