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Ravel Items ,.  _ _ _ Stitch

If y is an atom, then ,.y is 1 1$y ; otherwise, ,.y is ,"_1 y , the table formed by ravelling each item of y .
 		   x,.y is equivalent to x,"_1 y . In other words, items of x are stitched to corresponding items of y .

The fit conjunction (,.!.f) provides fill specified by the atom f .
 

For example:
   a=: i. 2 3 2
   ($,.3) ; (,.2 3 5 7 11) ; ($,.<'abcd') ; a ; (,.a)
+---+--+---+-----+-------------+
|1 1| 2|1 1| 0  1|0 1 2 3  4  5|
|   | 3|   | 2  3|6 7 8 9 10 11|
|   | 5|   | 4  5|             |
|   | 7|   |     |             |
|   |11|   | 6  7|             |
|   |  |   | 8  9|             |
|   |  |   |10 11|             |
+---+--+---+-----+-------------+
The following examples illustrate the dyadic case:
   b=:3 4$'abcdefghijkl' [ c=:3 4$'ABCDEFGHIJKL'
   b ; c ; (b,.c) ; (b,c) ; a ; (a ,. |."1 a) ; (,/a) ; (,./a)
+----+----+--------+----+-----+-----+-----+---------+
|abcd|ABCD|abcdABCD|abcd| 0  1| 0  1| 0  1|0 1  6  7|
|efgh|EFGH|efghEFGH|efgh| 2  3| 2  3| 2  3|2 3  8  9|
|ijkl|IJKL|ijklIJKL|ijkl| 4  5| 4  5| 4  5|4 5 10 11|
|    |    |        |ABCD|     | 1  0| 6  7|         |
|    |    |        |EFGH| 6  7| 3  2| 8  9|         |
|    |    |        |IJKL| 8  9| 5  4|10 11|         |
|    |    |        |    |10 11|     |     |         |
|    |    |        |    |     | 6  7|     |         |
|    |    |        |    |     | 8  9|     |         |
|    |    |        |    |     |10 11|     |         |
|    |    |        |    |     | 7  6|     |         |
|    |    |        |    |     | 9  8|     |         |
|    |    |        |    |     |11 10|     |         |
+----+----+--------+----+-----+-----+-----+---------+


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