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Task/Amb/TUSCRIPT/amb.tu

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+$$ MODE TUSCRIPT
+set1="the'that'a"
+set2="frog'elephant'thing"
+set3="walked'treaded'grows"
+set4="slowly'quickly"
+LOOP w1=set1
+ lastw1=EXTRACT (w1,-1,0)
+ LOOP w2=set2
+ IF (w2.sw.$lastw1) THEN
+  lastw2=EXTRACT (w2,-1,0)
+  LOOP w3=set3
+  IF (w3.sw.$lastw2) THEN
+   lastw3=EXTRACT (w3,-1,0)
+   LOOP w4=set4
+   IF (w4.sw.$lastw3) sentence=JOIN (w1," ",w2,w3,w4)
+   ENDLOOP
+  ENDIF
+  ENDLOOP
+ ENDIF
+ ENDLOOP
+ENDLOOP
+PRINT sentence