             STRUCTURES: each Fb
   text
 i sing of olaf glad and big
   
   words=. ;: text
   words
+-+----+--+----+----+---+---+
|i|sing|of|olaf|glad|and|big|
+-+----+--+----+----+---+---+
   
   1 0 2 3 { words
+----+-+--+----+
|sing|i|of|olaf|
+----+-+--+----+
   |. &. > 1 0 2 3 { words
+----+-+--+----+
|gnis|i|fo|falo|
+----+-+--+----+
   
   <;._1 text
+-+----+--+----+----+---+---+
|i|sing|of|olaf|glad|and|big|
+-+----+--+----+----+---+---+
