bbbb bbdd bbrg bd-r bdii bibb bibi bidi bidr bigb bigd bigg bigt birb bird birg biri birr birt bitd bitt brdt brid brig brit brrr btdt btrt bttb dbit dbtt dddd dibb didi digg digi diii dird dirr dirt diti ditt drib drit gddb gdrt ggbt gggg gibb gidd gidi gigg gigi gird girg giri girr girt grbr grib grid grig grit grrr gtbr ibid ibrd ibri ibtb idid idig idir igri iiii iiit iitr iitt iri- irid irig irri irti itri rbbb rbbr rgbi rgit rgtr rib- ridd ridi rigg rigi riri riti ritt rrrr rtdt tbit tbrb tddb tdri tibi tidd tigi tigr tiit tirb tird tiri tirr titi titt tri- trib trig trit trtr ttbb tttt