-er a-a a-b a-i aaa aab aad aae aag aai aap aar ab- aba abb abd abe abg abi abp abr ad- ada adb add ade adg adi adp adr aea aeb aed aee aeg aei aep aer ag- aga agb agd age agg agi agp agr ai- aia aib aid aie aig aii aip air ap- apa apb apd ape apg api app apr ar- ara arb ard are arg ari arp arr b-p baa bab bad bae bag bai bap bar bba bbb bbd bbe bbg bbi bbp bbr bda bdb bdd bde bdg bdi bdp bdr be- bea beb bed bee beg bei bep ber bga bgb bgd bge bgg bgi bgp bgr bi- bia bib bid bie big bii bip bir bpa bpb bpd bpe bpg bpi bpp bpr bra brb brd bre brg bri brp brr daa dab dad dae dag dai dap dar dba dbb dbd dbe dbg dbi dbp dbr dda ddb ddd dde ddg ddi ddp ddr de- dea deb ded dee deg dei dep der dga dgd dge dgg dgi dgp dgr di- dia dib did die dig dii dip dir dpa dpb dpd dpe dpg dpi dpp dpr dra drb drd dre drg dri drp drr eaa eab ead eae eag eai eap ear eba ebb ebd ebe ebg ebi ebp ebr ed- eda edb edd ede edg edi edp edr eea eeb eed eee eeg eep eer ega egb egd ege egg egi egp egr eia eib eid eie eig eii eip eir ep- epa epb epd epe epg epi epp epr era erb erd ere erg eri erp err g-d g-p gaa gab gad gae gag gai gap gar gba gbd gbe gbg gbi gbp gbr gda gdb gdd gde gdi gdp gdr ge- gea geb ged gee geg gei gep ger gga ggb ggd ggg ggi ggp ggr gia gib gid gie gig gii gip gir gpa gpb gpd gpe gpg gpi gpp gpr gra grb grd gre grg gri grp grr i-d ia- iaa iab iad iae iag iai iap iar iba ibb ibd ibe ibg ibi ibp ibr ida idb idd ide idg idi idp idr ie- iea ied iee ieg iei iep ier iga igb igd ige igg igi igp igr iia iib iid iie iii iip iir ipa ipb ipd ipe ipg ipi ipp ipr ir- ira irb ird ire irg iri irp irr p-p paa pab pad pae pag pai pap par pba pbb pbd pbe pbg pbi pbp pbr pda pdb pdd pde pdg pdi pdp pdr pea peb ped pee peg pei pep per pga pgb pgd pge pgg pgi pgp pgr pia pib pid pie pig pii pip pir ppa ppb ppd ppe ppg ppi ppp ppr pra prb prd pre prg pri prp prr ra- raa rab rad rae rag rai rap rar rba rbb rbd rbe rbg rbi rbp rbr rda rdb rdd rde rdg rdi rdp rdr re- rea reb red ree reg rei rep rer rga rgb rgd rge rgg rgi rgp rgr ria rib rid rie rig rii rip rir rpa rpb rpd rpe rpg rpi rpp rpr rra rrb rrd rrg rri rrp rrr