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Ravel | , _ _ _ | Append

`,y` gives a list of the atoms of`y` in “normal” order: the result is ordered by items, by items within items, etc. The result shape is`1$*/$ y` .`` Thus:
       y=: 2 4 $ 'abcdefgh'

       y
    abcd
    efgh

       ,y
    abcdefgh
|  | `x,y` appends items of`y` to items of`x` after:
1. | Reshaping an atomic argument to the shape of the items of the other,
2. | Bringing the arguments to a common rank (of at least 1) by repeatedly itemizing`` (`,:`)`` any of lower rank, and
3. | Bringing them to a common shape by padding with fill elements in the manner described in Section II B.
The fit conjunction`` (`,!.f`)`` provides fill specified by the items of`f` .

       ]a=: i. 2 3 3
     0  1  2
     3  4  5
     6  7  8

     9 10 11
    12 13 14
    15 16 17

       ,a
    0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

       ,"2 a
    0  1  2  3  4  5  6  7  8
    9 10 11 12 13 14 15 16 17

The following examples illustrate the dyadic case:

       ('abc','de');('abc',"0/'de');(5 6 7,i.2 3);(7,i.2 3)
    +-----+--+-----+-----+
    |abcde|ad|5 6 7|7 7 7|
    |     |ae|0 1 2|0 1 2|
    |     |  |3 4 5|3 4 5|
    |     |bd|     |     |
    |     |be|     |     |
    |     |  |     |     |
    |     |cd|     |     |
    |     |ce|     |     |
    +-----+--+-----+-----+

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