b-u bbb bbn bbr bbs bbu bnb bnn bnr bns bnu brb brn brr brs bru bsb bsn bsr bss bsu bub bun bur bus buu nbb nbn nbr nbs nbu nnb nnn nns nnu nrb nrn nrr nrs nru nsb nsn nsr nss nsu nub nun nur nus nuu rbb rbn rbr rbs rbu rnb rnn rnr rns rnu rrb rrn rrr rrs rru rsb rsn rsr rss rsu rub run rur rus ruu sbb sbn sbr sbs sbu snb snn snr sns snu sr- srb srn srr srs ss- ssb ssn ssr sss ssu sub sun sur sus suu ubb ubn ubr ubs ubu un- unb unn unr uns unu ur- urb urn urr urs uru usb usn usr uss usu uun uur uus uuu

bbbb bbbs bnrr bnss brns brrr brrs brsb brsr brun brus bsns bubb bubs bubu bunb bunn buns bunu bur- burb burn burr burs buru buss busu buus nnnn nnss nsnr nssb nssr nsss nsub nubs nunn nuns nurn nurr nurs nuru nuss nusu rbbb rbbr rbbs rbss rnbr rrrr rrun rsnn rsnr rubb rubs rubu runn runs rurs ruru russ rusu ruun sbbs sbus snns snrs snub snur snus srnn srub ssbn ssbr ssns ssrs sssb ssss sub- subb subs sun- sunb sunn suns sunu sur- surn surr surs suru sus- suss susu suus unns unrs uns- unus urbs urns urss ursu urun urur urus usbr usbs usnr usnu ussb ussr usss ussu usun usus uuuu

bbuss brrrr brunn bruns bruss bruun bunun bunus burbs burn- burns burrs burru burun burus bussu busur busuu n-sub nu-nu nubus nunns nunun nursu nurun nurus nusus rubus s-bus snbrn snub- snubs snuss sssrb sssss subbu subss sunbs surur surus susun susus suuns unnun unnur unrun unsu unsub unsun unurn ursus urubu ussun uuuuu

bbbbbb brubru bububu burbur nurnus nusnus russus subsun suburb sunbus sunrun sunsun sununu susurr ubussu unburn unsubs

bbbbbbb burruss sssssss suburbs sun-sun

bbbbbbbb buruburu sunburns sussurus susurrus

runrunrun snubsbuns

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