Can (A) \(90\) light bulbs, (B) \(73\) light bulbs be connected with wires so that each of them is connected by a wire to exactly \(5\) other light bulbs?

Vai (A) \(90\) lampiņas, (B) \(73\) lampiņas ar vadiem var savienot tā, lai katra no tām būtu savienota ar vadu ar tieši \(5\) citām lampiņām?