(define a1 {
'name "Rocket Skates"
'price 12.75
'color "yellow"
})
(define a2 {
'price 15.25
'color "red"
'year 1974
(print "a1: " a1)
(print "a2: " a2)
(define (collide a b) b) ; will use new key value
(print "merged a1 a2: " (ff-union collide a1 a2))