+STR
+DOC ---
+MAP
+MAP
=VAL :x
=VAL :y
-MAP
=VAL :z
=VAL :a
=VAL :b
-MAP
-DOC
+DOC ---
+MAP
=VAL :top1
+MAP
+MAP
=VAL :a
=VAL :1
-MAP
+MAP
=VAL :b
+SEQ []
=VAL :c
-SEQ
-MAP
=VAL :x
=VAL :y
-MAP
=VAL :top2
=VAL :value
-MAP
-DOC
-STR