diff -r c02929f2647c -r 6e1237691307 progs/lecture5.scala
--- a/progs/lecture5.scala	Mon Dec 07 01:25:41 2020 +0000
+++ b/progs/lecture5.scala	Fri Jan 15 02:40:57 2021 +0000
@@ -3,6 +3,19 @@
 
 
 
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 // Laziness with style
 //=====================
 
@@ -422,6 +435,18 @@
 subset(nfa).accepts("aaaaabbbaaa".toList)    // false
 subset(nfa).accepts("ac".toList)             // false
 
+import scala.math.pow
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 // The End ... Almost Christmas