diff --git a/day-4/one.go b/day-4/one.go
index d806877..fa54c38 100644
--- a/day-4/one.go
+++ b/day-4/one.go
@@ -5,6 +5,15 @@ import (
 	"unicode"
 )
 
+// Card represents a single card.
+// it tracks its number of matches and occurrences
+type Card struct {
+	matches     int
+	occurrences int
+}
+
+var cards = []Card{}
+
 // one computes points based on matching numbers
 func one(lines []string) (int, error) {
 	f := func(c rune) bool {
diff --git a/day-4/two.go b/day-4/two.go
index 8732ca5..96b9754 100644
--- a/day-4/two.go
+++ b/day-4/two.go
@@ -1,14 +1,5 @@
 package main
 
-// Cards represents a single card.
-// it tracks its matching numbers and occurrences
-type Card struct {
-	matches     int
-	occurrences int
-}
-
-var cards = []Card{}
-
 // two returns the total number of occurrences for all cards
 func two(lines []string) (int, error) {
 	var sum = 0