-er a-a a-b a-i aaa aab aad aae aai aap aar aas ab- aba abb abd abe abi abp abr abs ad- ada adb add ade adi adp adr ads aea aeb aed aee aei aep aer aes ai- aia aib aid aie aii aip air ais ap- apa apb apd ape api app apr aps ar- ara arb ard are ari arp arr ars as- asa asb asd ase asi asp asr ass b-p baa bab bad bae bai bap bar bas bba bbb bbd bbe bbi bbp bbr bbs bda bdb bdd bde bdi bdp bdr bds be- bea beb bed bee bei bep ber bes bi- bia bib bid bie bii bip bir bis bpa bpb bpd bpe bpi bpp bpr bps bra brb brd bre bri brp brr brs bsa bsb bsd bse bsi bsp bsr bss daa dab dad dae dai dap dar das dba dbb dbd dbe dbi dbp dbr dbs dda ddb ddd dde ddi ddp ddr dds de- dea deb ded dee dei dep der des di- dia dib did die dii dip dir dis dpa dpb dpd dpe dpi dpp dpr dps dra drb drd dre dri drp drr drs dsa dsb dsd dse dsi dsp dsr dss eaa eab ead eae eai eap ear eas eba ebb ebd ebe ebi ebp ebr ebs ed- eda edb edd ede edi edp edr eds eea eeb eed eee eep eer ees eia eib eid eie eii eip eir eis ep- epa epb epd epe epi epp epr eps era erb erd ere eri erp err ers es- esa esb esd ese esi esp esr ess i-d ia- iaa iab iad iae iai iap iar ias iba ibb ibd ibe ibi ibp ibr ibs ida idb idd ide idi idp idr ids ie- iea ied iee iei iep ier ies iia iib iid iie iii iip iir iis ipa ipb ipd ipe ipi ipp ipr ips ir- ira irb ird ire iri irp irr irs is- isa isb isd ise isi isp isr iss p-p paa pab pad pae pai pap par pas pba pbb pbd pbe pbi pbp pbr pbs pda pdb pdd pde pdi pdp pdr pds pea peb ped pee pei pep per pes pia pib pid pie pii pip pir pis ppa ppb ppd ppe ppi ppp ppr pps pra prb prd pre pri prp prr prs ps- psa psb psd pse psi psp psr pss ra- raa rab rad rae rai rap rar ras rba rbb rbd rbe rbi rbp rbr rbs rda rdb rdd rde rdi rdp rdr rds re- rea reb red ree rei rep rer res ria rib rid rie rii rip rir ris rpa rpb rpd rpe rpi rpp rpr rps rra rrb rrd rri rrp rrr rrs rsa rsb rsd rse rsi rsp rsr rss saa sab sad sae sai sap sar sas sba sbb sbd sbe sbi sbp sbr sbs sda sdb sdd sde sdi sdp sdr sds se- sea seb sed see sei sep ser ses sia sib sid sie sii sip sir sis spa spb spd spe spi spp spr sps sr- sra srb srd sre sri srp srr srs ss- ssa ssb ssd sse ssi ssp ssr sss