bbb bbd bbe bbf bbt bdb bdd bde bdf bdt be- beb bed bee bef bet bfb bfd bfe bff bft btb btd bte btf btt dbb dbd dbe dbf dbt ddb ddd dde ddf ddt de- deb ded dee def det dfb dfd dfe dff dft dtb dtd dte dtf dtt ebb ebd ebe ebf ebt ed- edb edd ede edf edt eeb eed eee eef eet ef- efb efd efe eff eft etb etd ete etf ett fbb fbd fbe fbf fbt fdb fdd fde fdf fdt feb fed fee fef fet ffd ffe fff fft ftb ftd fte ftf ftt tbb tbd tbe tbf tbt tdb tdd tde tdf tdt te- teb ted tee tef tet tfb tfd tfe tff tft ttb ttd tte ttf ttt