Syntax: optional elements

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Syntax: optional elements

Alejandro Pulver
Hello,

How can I make some syntax elements optional (that can be there or not)?

For example:

add 5, 7
loop: sub 3, 5
jmp -2

The middle line has an optional label, and the others don't, also the
third line has not a second field.

How can I implement this?

Thanks and Best Regards,
Ale