-er eee een eep eer eie eii ein eip eir en- ene eni enn enp enr ep- epe epi epn epp epq epr eqe eqn eqp eqq ere eri ern erp erq err ie- iee iei ien iep ier iie iii iin iip iir in- ine ini inn inp inq inr ipe ipi ipn ipp ipr iqe ir- ire iri irn irp irq irr n-i ne- nee nei nen nep ner nie nii nin nip niq nir nne nni nnn nnp npe npi npn npp npr nre nri nrn nrp nrr p-p pee pei pen pep per pie pii pin pip piq pir pn- pne pni pnn pnp pnr ppe ppi ppn ppp ppq ppr pqi pqq pqr pre pri prn prp prq prr qee qen qep qie qin qip qir qne qni qpp qpr qqq qre qri qrp re- ree rei ren rep req rer rie rii rin rip riq rir rni rnn rnp rnr rpe rpi rpn rpp rpr rqn rri rrn rrp rrq rrr