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Task/Amb/Seed7/amb.seed7

@@ -0,0 +1,51 @@
+$ include "seed7_05.s7i";
+
+const type: setListType is array array string;
+
+const func array string: amb (in string: word1, in setListType: listOfSets) is func
+  result
+    var array string: ambResult is 0 times "";
+  local
+    var string: word2 is "";
+  begin
+    for word2 range listOfSets[1] do
+      if length(ambResult) = 0 and word1[length(word1) len 1] = word2[1 len 1] then
+        if length(listOfSets) = 1 then
+          ambResult := [] (word1) & [] (word2);
+        else
+          ambResult := amb(word2, listOfSets[2 ..]);
+          if length(ambResult) <> 0 then
+            ambResult := [] (word1) & ambResult;
+          end if;
+        end if;
+      end if;
+    end for;
+  end func;
+
+const func array string: amb (in setListType: listOfSets) is func
+  result
+    var array string: ambResult is 0 times "";
+  local
+    var string: word1 is "";
+  begin
+    for word1 range listOfSets[1] do
+      if length(ambResult) = 0 then
+        ambResult := amb(word1, listOfSets[2 ..]);
+      end if;
+    end for;
+  end func;
+
+const proc: main is func
+  local
+    var array string: ambResult is 0 times "";
+    var string: word is "";
+  begin
+    ambResult := amb([] ([] ("the", "that", "a"),
+                         [] ("frog", "elephant", "thing"),
+                         [] ("walked", "treaded", "grows"),
+                         [] ("slowly", "quickly")));
+    for word range ambResult do
+      write(word <& " ");
+    end for;
+    writeln;
+  end func;