bbb bbc bbe bbm bbn bcb bcc bce bcm bcn be- beb bec bee bem ben bmb bmc bme bmm bmn bnb bnc bne bnn c-- cbb cbc cbe cbm cbn ccb ccc cce ccm ccn ce- ceb cec cee cem cen cmb cmc cme cmm cmn cn- cnb cnc cne cnm cnn ebb ebc ebe ebm ebn ec- ecb ecc ece ecm ecn eeb eec eee eem een em- emb emc eme emm emn en- enb enc ene enm enn mbb mbc mbe mbm mc- mcb mcc mce mcm mcn meb mec mee mem men mmb mmc mme mmm mmn mnb mnc mne mnm mnn nbb nbc nbe nbm nbn ncb ncc nce ncm ncn ne- neb nec nee nem nen nmb nmc nme nmm nmn nnb nnc nne nnm nnn