naming

Functions

generate_node_names(number_of_nodes)
multiple_unique_new_node_names(k, count)	Returns a natural next available node names for the graph/knot K.
number_to_alpha(n)	Convert number to ASCII string, e.g. 0 -> "a", 1 -> "b", 51 -> "Z", 52 -> "aa", .
unique_new_node_name(k)	Returns a natural next available node names for the graph/knot K.