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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 atom 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)
+-----+--+-----+-----+