bbbb bbci bbdd bcbc bccc bcci bcuc bdbc bddc bdii bibb bibi bicc bici bidi bidu bubb bubi bubu bucc buci bucu budb budd budi budu buic buid buiu c-cd cbbc cbcc cbcu cbdb cbdc cbdi cbid ccbc cccb cccc ccci cccu ccdc ccdi ccic ccid ccii ccuc cddb cdic cdii cibc cibi cicc cici cicu cidc cidi ciid ciii ciuc cub- cubb cubi cucc cuci cudi cui- dbcc dcbc dccb dccc dcci dccu dcdb dcii dddd ddub dibb dici didi didu diii dub- dubb dubc dubu dudd dudu duid ibid icbc icbd iccb iccc icci iccu icdc icdd icub idic idid idub iicd iiii iiuc iucc iuiu ubbi ubic ubid ubii ubud ucbc ucci ucdc ucdd udbc uddi udic udid uuuu