enka
fu'ivla
x1 (terbricmi) is bound to x2 (sumti) by relationship x3 (relationship with two {ce'u} for x1 and x2)
Used to more precisely express relationship (whether fuzzy or not) between terbricmi (predicate slots) and arguments (sumti) filling those slots.
See also ckini, va'e, jei, sela'u.