;;GLOBAL

ID_KEY page

filter default with trim

;;a

filter * with trim

page is word
i    is num
n    is num

;;b

filter * with trim, x

page is word
i    is num
n    is num

;;c

filter * with  trim, x2

page is word
i    is num
n    is num

;;d

filter * with x2

page is word
i    is num
n    is num

;;e

filter i,n with x2

a = all of-valid i, n, page

page is word
i    is word
n    is word