when defining a verb, the J Primer says to write this:

centigrade =. 3 : 0
>
> what is the 3 for there? I assumed it was because following that
statement, the primer says to define three variables, t1, t2, and t3, but
then on the next page it uses the same definition, but only defines one
variable. Also, what is the zero for?

Thanks,
-Jake
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