--- a/progs/bf/bfi.sc	Mon Jul 27 11:02:48 2020 +0100
+++ b/progs/bf/bfi.sc	Thu Jul 30 13:50:54 2020 +0100
@@ -7,12 +7,10 @@
 //
 
 
-import scala.util._
-
-// BF memory as a map
+// BF memory is represented as a Map
 type Mem = Map[Int, Int]
 
-// reading and writing BF memory
+// safe reading and writing of BF memory
 def sread(mem: Mem, mp: Int) : Int = 
   mem.getOrElse(mp, 0)