]> G 1 a 1->a 2 b 2->b 3 c 3->c 4 d 4->d 5 e 5->e 6 f 6->f 7 g 7->g 8 h 8->h 10 20 30 40 50 60 70 80 A a->A B a->B b->A b->B C c->C D c->D d->C d->D E e->E F e->F f->E f->F G g->G H g->H h->G h->H i I i->I K i->K j J j->J L j->L k k->I k->K l l->J l->L m M m->M O m->O n N n->N P n->P o o->M o->O p p->N p->P q Q q->Q U q->U r R r->R V r->V s S s->S W s->W t T t->T X t->X u u->Q u->U v v->R v->V w w->S w->W x x->T x->X A->i B->j C->k D->l E->m F->n G->o H->p I->q J->r K->s L->t M->u N->v O->w P->x Q->10 R->20 S->30 T->40 U->50 V->60 W->70 X->80