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types of edges
In addition to these tree edges, there are three other edge types that are determined by a DFS tree: forward edges, cross edges, and back edges. A forward edge is a non-tree edge from a vertex to one of its descendants.
patterns of the veins:Vascular pattern recognition, also commonly referred to as vein pattern authentication, uses near-infrared light to reflect or transmit images of blood vessels. Researchers have determined that the vascular pattern of the human body is unique to a specific individual and does not change as people age.
modification is a noun but it means Modification is a change that is made, or is the act of changing something. exmaple : When a plan is in place and you make a slight change to the plan such as building a wall one inch taller, this is an example of modification.