B3O1U1S1T1R1O1P3H4E1D2O1N1S1
22 points
BOUSTROPHEDONS is validvalid
BOUSTROPHEDON, horizontal script whose direction alternates by line [n]
BOUSTROPHEDON, (Greek) a method of writing in which lines are written alternately in opposite direction, from left to right, and right to left [n]