recognize a named node next to a descending edge part
recognize a named node next to an ascending edge part
recognize a named node next to a vertical edge part
recognize a named node next to an edge name
recognize a horizontal edge next to a root node
reconize token combos that start with descending edge part
reconize token combos that start with ascending edge part
reconize token combos that start with vertical edge part
reconize token combos that start with edge name