diff --git a/day10/sol.ivy b/day10/sol.ivy
index 337130c..58d793a 100644
--- a/day10/sol.ivy
+++ b/day10/sol.ivy
@@ -3,9 +3,9 @@
 op run ins =
     ((1 + ins != 0), 0) sel +\ 1, ins
 
-op signal xs = 
-    n = rho xs
-    i = (20 == (iota n) mod 40) sel iota n
+op signal xs =
+    cycle = iota rho xs
+    i = (20 == cycle mod 40) sel cycle
     +/ xs[i] * i
 
 op render xs =