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48 bytes added , 16:19, 8 June 2021

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-<source lang=apl inline>⊢</source> is the [[identity]] function, which is just used here get the pass-though value from the assignment, as it would otherwise be hidden. (We call assignment ''[[shy]]''.) <source lang=apl inline>\</source> is just like <source lang=apl inline>/</source> but gives us the intermediate values.
+Assigning to the special ''Quad character'' (the stylised console, <source lang=apl inline>⎕</source>) sends the the pass-though value from the assignment to the console (the screen), as it would otherwise be hidden. (We call assignment ''[[shy]]''.) <source lang=apl inline>\</source> is just like <source lang=apl inline>/</source> but gives us the intermediate values.
 === Combining arrays ===