diff --git a/phase1.dyalog b/phase1.dyalog
index 07c9234..3ddcb65 100644
--- a/phase1.dyalog
+++ b/phase1.dyalog
@@ -5,6 +5,8 @@
  {(~⍵∊127+⍳64)⊂⍵}
  ⍝ 3: Excel-lent Columns
  (26⊥64-⍨⎕UCS)
+ ⍝ 4: Take a Leap
+ (1 3∊⍨(0+.=400 100 4∘.|⊢))
  ⍝ 6: Please Move to the Front
  {⍵[⍋⍺≠⍵]}
  ⍝ 7: See You in a Bit