a-a a-z aaa aad aap aar aaz ad- ada add adp adr adz ap- apa apd app apr ar- ara ard arp arr arz az- aza azd azp azz daa dad dap dar daz dda ddd ddp ddr ddz dpa dpd dpp dpr dpz dra drd drp drr drz dza dzd dzp dzr p-p paa pad pap par paz pda pdd pdp pdr pdz ppa ppd ppp ppr ppz pra prd prp prr prz pzp ra- raa rad rap rar raz rda rdd rdp rdr rpa rpd rpp rpr rpz rra rrd rrp rrr rza zaa zad zap zar zaz zpp zpr zrp zzr zzz