-er -up a-a a-b a-c aaa aab aac aad aae aap aar aas aau ab- aba abb abc abd abe abp abr abs abu ac- aca acb acc acd ace acp acr acs acu ad- ada adb adc add ade adp adr ads adu aea aeb aec aed aee aep aer aes aeu ap- apa apb apc apd ape app apr aps apu ar- ara arb arc ard are arp arr ars aru as- asa asb asc asd ase asp asr ass asu au- aua aub auc aud aue aup aur aus b-p b-u baa bab bac bad bae bap bar bas bau bba bbb bbc bbd bbe bbp bbr bbs bbu bca bcb bcc bcd bce bcp bcr bcs bcu bda bdb bdc bdd bde bdp bdr bds bdu be- bea beb bec bed bee bep ber bes beu bpa bpb bpc bpd bpe bpp bpr bps bpu bra brb brd bre brp brr brs bru bsa bsb bsc bsd bse bsp bsr bss bsu bua bub buc bud bue bup bur bus buu c-- caa cab cac cad cae cap car cas cau cba cbb cbc cbd cbe cbp cbr cbs cbu cca ccb ccc ccd cce ccp ccr ccs ccu cda cdb cdc cdd cde cdp cdr cds cdu ce- cea ceb cec ced cee cep cer ces ceu cpa cpb cpc cpd cpe cpp cpr cps cpu cra crb crc crd cre crp crr crs cru csa csb csc csd cse csp csr css csu cua cub cuc cud cue cup cur cus cuu daa dab dac dad dae dap dar das dau dba dbb dbc dbd dbe dbp dbr dbs dbu dca dcb dcc dcd dce dcp dcr dcs dcu dda ddb ddc ddd dde ddp ddr dds ddu de- dea deb dec ded dee dep der des deu dpa dpb dpc dpd dpe dpp dpr dps dpu dra drb drc drd dre drp drr drs dru dsa dsb dsc dsd dse dsp dsr dss dsu dua dub duc dud due dup dur dus eaa eab eac ead eae eap ear eas eau eba ebb ebc ebd ebe ebp ebr ebs ebu ec- eca ecb ecc ecd ece ecr ecs ecu ed- eda edb edc edd ede edp edr eds edu eea eeb eec eed eee eep eer ees ep- epa epb epc epd epe epp epr eps epu era erb erc erd ere erp err ers eru es- esa esb esc esd ese esp esr ess esu eu- eua eub euc eud eue eup eur eus p-p paa pab pac pad pae pap par pas pau pba pbb pbc pbd pbe pbp pbr pbs pbu pca pcb pcc pcd pce pcp pcr pcs pcu pda pdb pdc pdd pde pdp pdr pds pdu pea peb pec ped pee pep per pes peu ppa ppb ppc ppd ppe ppp ppr pps ppu pra prb prc prd pre prp prr prs pru ps- psa psb psc psd pse psp psr pss psu pua pub puc pud pue pup pur pus puu ra- raa rab rac rad rae rap rar ras rau rba rbb rbc rbd rbe rbp rbr rbs rbu rca rcb rcc rcd rce rcp rcr rcs rcu rda rdb rdc rdd rde rdp rdr rds rdu re- rea reb rec red ree rep rer res reu rpa rpb rpc rpd rpe rpp rpr rps rpu rra rrb rrc rrd rrp rrr rrs rru rsa rsb rsc rsd rse rsp rsr rss rsu rua rub ruc rud rue rup rur rus ruu saa sab sac sad sae sap sar sas sau sba sbb sbc sbd sbe sbp sbr sbs sbu sca scb scc scd sce scp scr scs scu sda sdb sdc sdd sde sdp sdr sds sdu se- sea seb sec sed see sep ser ses seu spa spb spc spd spe spp spr sps spu sr- sra srb src srd sre srp srr srs ss- ssa ssb ssc ssd sse ssp ssr sss ssu sua sub suc sud sue sup sur sus suu ua- uaa uab uac uad uae uap uar uas uau uba ubb ubc ube ubp ubr ubs ubu uca ucb ucc ucd uce ucp ucr ucs ucu uda udb udc udd ude udp udr uds udu uea ueb uec ued uee uep uer ues up- upa upb upc upd upe upp upr ups upu ur- ura urb urc urd ure urp urr urs uru usa usb usc usd use usp usr uss usu uua uuc uue uur uus uuu