from succ import succ as successors

def bfs(istate, goalstate):
    fringe = [istate]
    explored = []
    while(fringe):
        state = fringe.pop(0)
        if state == goalstate : 
                return 
        element = successors(state)
        explored.append(state)
        for value in element :
            if value not in explored :
                fringe.append(value)
    return False