RosettaCodeData/Task/Amb/TXR/amb-4.txr

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@(define first_last (first last whole))
@ (all)
@(skip :greedy)@{last 1}
@ (and)
@{first 1}@(skip)
@ (and)
@whole
@ (end)
@(end)
@(next :list ("the" "that" "a"))
@(skip)
@(first_last fi1 la1 w1)
@(next :list ("frog" "elephant" "thing"))
@(skip)
@(first_last la1 la2 w2)
@(next :list ("walked" "treaded" "grows"))
@(skip)
@(first_last la2 la3 w3)
@(next :list ("slowly" "quickly"))
@(skip)
@(first_last la3 la4 w4)
@(output)
@w1 @w2 @w3 @w4
@(end)