--- a/pre_solution1/collatz.scala	Wed Nov 25 18:25:15 2020 +0000
+++ b/pre_solution1/collatz.scala	Fri Nov 27 00:55:24 2020 +0000
@@ -31,6 +31,7 @@
 
 */
 
+
 def is_pow(n: Long) : Boolean = (n & (n - 1)) == 0
 
 def is_hard(n: Long) : Boolean = is_pow(3 * n + 1)
@@ -41,6 +42,7 @@
       last_odd(3 * n + 1)
 
 
+
 //for (i <- 130 to 10000) println(s"$i: ${last_odd(i)}")
 //for (i <- 1 to 100) println(s"$i: ${collatz(i)}")