1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
+STR +DOC --- +MAP {} =VAL :a +SEQ [] =VAL :b =VAL :c +MAP {} =VAL :d +SEQ [] =VAL :e =VAL :f -SEQ -MAP -SEQ -MAP -DOC -STR