eee eef eeg eep ef- efe eff efg efi efp ege egf egg egi egp eie eif eig eii eip ep- epe epf epg epi epp fee fef feg fei fep ffe fff ffg ffi ffp fge fgf fgg fgi fgp fie fif fig fii fip fpe fpg fpi fpp g-p ge- gee gef geg gei gep gfe gff gfi gfp ggg ggi ggp gie gif gig gii gip gpe gpf gpg gpi gpp i-f ie- iee ief ieg iei iep ife iff ifg ifi ifp ige igf igg igi igp iie iif iii iip ipe ipf ipg ipi ipp p-p pee pef peg pei pep pfe pff pfg pfi pfp pge pgf pgg pgi pgp pie pif pig pii pip ppe ppf ppg ppi ppp