need help with list variable and dropped items

[loadka95]

I want to delete every item from the ground if I run this command (/bdelete), but if the list variable has item in it, don't delete those, just everything else.

so far this is what i got, but its not working properly

command /ba [<item>]:
    trigger:
        add arg 1 to {tlist::*}
command /bdelete:
    trigger:
        loop all dropped items:
            loop {tlist::*}:
                if items within entity loop-value-1 != loop-value-2:
                    delete loop-value-1