I'll be damned if I can get it to work. I tried it with a custom identifier and it didn't work.

alias testing return a,b,c
//var -s %a = a b c d | echo -a $remove(%a,$testing)

I also tried it using /tokenize and still nothing.
//var -s %a = a b c d | tokenize 32 a,b,c | echo -a $remove(%a,$1)

And with the varables, still nothing.
//var -s %a = d c b a | var -s %b = a,b,c | echo -a $remove(%a,%b)

I would think all three of these methods should work, but they don't. confused