bbbb bblb bibb bibi bibl bili bill bilu bily birb biri birl birr biru biry blir blub blur bly- bril brrr bry- bubb bubi bubu buir buiu bulb buli bull bulu bur- burb buri burl burr buru bury buyi buyl buyu byil byul i-by ibly ibri ibuy ibyi iiii ilir ill- illi illy iluy irby iri- iril iriy irlb irri irul iuiu lblr libr libu liii liir lilb lili lill lilu lily liri lirl lirr liru liry liyl liyu llll llyr lrrr lrry luby luli lull lulu luri lury luyi lyly rbbb rbbr rib- ribu riby rill rilu rily riri rrrr rubb rubi rubu ruby rull ruly ruri ruru ruyi ruyl ubbi ubii ubir ubli ubly uirr ulli ullr ully ulul urbi urib uriu urri urry urur uulu uuri uuuu uyir ybry yili yill yirb yirr ylli yrly yubu yuli yulu yuri yury yuyu yyyy