The examples for 3.15 Monadic ⊢ and ⊣, dyadic ⊢ with Axis should read:
A←2 3⍴'abcdef'
B←2 3⍴⍳6
X←2 3⍴0 1 0 1 0 1
A ⊢[X] B
a 2 c
4 e 6
A ⊢[X] '*'
a*c
*e*
'*' ⊢[X] B
* 2 *
4 * 6
(I have copied and pasted this code from an actual GNU APL session.)
