In einer eMail vom 12.07.2008 21:04:28 Westeuropäische Normalzeit schreibt [EMAIL PROTECTED]:
Would you like to redraw your red arrows? Can you think of a configuration of red arrows where you get *both* H->G->C->B->A *and* D->C->G->F->E ? Well, it requires a red arrow not only from B to C but also from C to B. But then all black lines are replaced by pairs of oppositely directed arrows. So we have no restricted situation anymore. Heiner, shruging my shoulders
