}

  @Test
  public void forGraph_breadthFirstIterable_multiGraph() {
    Traverser<Character> traverser = Traverser.forGraph(MULTI_GRAPH);
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("ac")), "acbd");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("cb")), "cbad");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("db")), "db");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("d")), "d");

  }

  @Test
  public void forGraph_breadthFirstIterable_multiGraph() {
    Traverser<Character> traverser = Traverser.forGraph(MULTI_GRAPH);
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("ac")), "acbd");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("cb")), "cbad");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("db")), "db");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("d")), "d");

Incidence out of Air into Glass be to the Sine of Refraction as 17 to 11, the Sine of Incidence out of Glass into Air must on the contrary be to the Sine of Refraction as 11 to 17, by the third Axiom. [Illustration: FIG. 2.] Much after the same manner, if ACBD [in _Fig._ 3.] represent a Glass spherically convex on both sides (usually called a _Lens_, such as is a Burning-glass, or Spectacle-glass, or an Object-glass of a Telescope) and it be required to know how Light falling upon it from any lucid point...

out of Glass into Air must on the contrary be to the Sine of Refraction
as 11 to 17, by the third Axiom.

[Illustration: FIG. 2.]

Much after the same manner, if ACBD [in _Fig._ 3.] represent a Glass
spherically convex on both sides (usually called a _Lens_, such as is a
Burning-glass, or Spectacle-glass, or an Object-glass of a Telescope)

tf.reduce_join(a, 0, keep_dims=True) ==> [["ac", "bd"]]
tf.reduce_join(a, 1, keep_dims=True) ==> [["ab"], ["cd"]]
tf.reduce_join(a, 0, separator=".") ==> ["a.c", "b.d"]
tf.reduce_join(a, [0, 1]) ==> "acbd"
tf.reduce_join(a, [1, 0]) ==> "abcd"
tf.reduce_join(a, []) ==> [["a", "b"], ["c", "d"]]
tf.reduce_join(a) = tf.reduce_join(a, [1, 0]) ==> "abcd"
```
  }];

  let arguments = (ins