-er a-a a-b a-c aaa aab aac aae aah aap aar ab- aba abb abc abe abh abp abr ac- aca acb acc ace ach acp acr aea aeb aec aee aeh aep aer aha ahb ahc ahe ahh ahp ahr ap- apa apb apc ape aph app apr ar- ara arb arc are arh arp arr b-p baa bab bac bae bah bap bar bba bbb bbc bbe bbh bbp bbr bca bcb bcc bce bch bcp bcr be- bea beb bec bee beh bep ber bha bhb bhc bhe bhh bhp bhr bpa bpb bpc bpe bph bpp bpr bra brb bre brh brp brr c-- caa cab cac cae cah cap car cba cbb cbc cbe cbh cbp cbr cca ccb ccc cce cch ccp ccr ce- cea ceb cec cee ceh cep cer ch- cha chb chc che chh chp chr cpa cpb cpc cpe cph cpp cpr cra crb crc cre crh crp crr eaa eab eac eae eah eap ear eba ebb ebc ebe ebh ebp ebr ec- eca ecb ecc ece ech ecr eea eeb eec eee eep eer eha ehb ehc ehe ehh ehp ehr ep- epa epb epc epe eph epp epr era erb erc ere erh erp err haa hab hac hae hah hap har hba hbb hbc hbe hbh hbp hbr hca hcb hcc hce hch hcp hcr he- hea heb hec hee heh hep her hha hhb hhc hhe hhh hhp hhr hpa hpb hpc hpe hph hpp hpr hr- hra hrb hrc hre hrh hrp hrr p-p paa pab pac pae pah pap par pba pbb pbc pbe pbp pbr pca pcb pcc pce pch pcp pcr pea peb pec pee peh pep per pha phb phc phe php phr ppa ppb ppc ppe pph ppp ppr pra prb prc pre prh prp prr ra- raa rab rac rae rah rap rar rba rbb rbc rbe rbh rbp rbr rca rcb rcc rce rch rcp rcr re- rea reb rec ree reh rep rer rh- rha rhb rhc rhe rhh rhp rhr rpa rpb rpc rpe rph rpp rpr rra rrb rrc rrh rrp rrr