open Graph
open Gfile
open Tools

val fst3 : ('a * 'b * 'c) -> 'a

val snd3 : ('a * 'b * 'c) -> 'b

val thrd3 : ('a * 'b * 'c) -> 'c

val buildGraph : (string * int * int) list -> int graph

val getMaximumNodeId : 'a graph -> int


val addChildren : (id * string * int list) list -> int graph -> int graph