-er a-a a-b a-i aaa aab aae aah aai aan aao aar ab- aba abb abe abh abi abn abo abr aea aeb aee aeh aei aen aeo aer aha ahb ahe ahh ahi ahn aho ahr ai- aia aib aie aih aii ain aio air an- ana anb ane anh ani ann ano anr aoa aob aoe aoh aoi aon aoo aor ar- ara arb are arh ari arn aro arr baa bab bae bah bai ban bao bar bba bbb bbe bbh bbi bbn bbo bbr be- bea beb bee beh bei ben beo ber bha bhb bhe bhh bhi bho bhr bi- bia bib bie bih bii bin bio bir bna bnb bne bni bnn bno bnr boa bob boe boh boi bon boo bor bra brb bre brh bri brn bro brr eaa eab eae eah eai ean eao ear eba ebb ebe ebh ebi ebn ebo ebr eea eeb eee een eeo eer eha ehb ehe ehh ehi ehn eho ehr eia eib eie eii ein eio eir en- ena enb ene enh eni enn eno enr eo- eoa eob eoe eoh eoi eon eoo eor era erb ere erh eri ern ero err h-i haa hab hae hah hai han hao har hba hbb hbe hbh hbi hbn hbo hbr he- hea heb hee heh hei hen heo her hha hhb hhe hhh hhi hhn hho hhr hia hib hie hih hii hin hio hir hna hnb hne hnh hnn hno hoa hob hoe hoh hoi hon hoo hor hr- hra hrb hre hrh hri hrn hro hrr ia- iaa iab iae iah iai ian iao iar iba ibb ibe ibh ibi ibn ibo ibr ie- iea iee iei ien ier iha ihb ihe ihh ihi ihn iho ihr iia iib iie iih iii iin iio iir in- ina inb ine inh ini inn ino inr io- ioa iob ioe ioh ioi ion ioo ior ir- ira irb ire iri irn iro irr n-i naa nab nae nah nai nan nao nar nba nbb nbe nbi nbn nbo nbr ne- nea neb nee neh nei nen neo ner nha nhb nhe nhh nhi nhn nhr nia nib nie nih nii nin nio nir nna nnb nne nnh nni nnn nno no- noa nob noe noh noi non noo nor nra nrb nre nri nrn nro nrr o-i oaa oab oae oah oai oan oao oar ob- oba obb obe obh obi obn obo obr oea oeb oee oeh oei oen oeo oer oha ohe ohh ohi ohn oho ohr oia oib oie oii oin oio oir on- ona onb one onh oni onn ono onr oo- ooa oob ooh ooi oon ooo oor or- ora orb ore orh ori orn oro orr ra- raa rab rae rah rai ran rao rar rba rbb rbe rbh rbi rbn rbo rbr re- rea reb ree reh rei ren reo rer rh- rha rhb rhe rhh rhi rhn rho rhr ria rib rie rih rii rin rio rir rna rnb rnh rni rnn rno rnr roa rob roe roh roi ron roo ror rra rrb rrh rri rrn rrr