diff --git a/20201201/main.go b/20201201/main.go
index 789394e..d360851 100644
--- a/20201201/main.go
+++ b/20201201/main.go
@@ -10,7 +10,7 @@ func isEcho(s string) bool {
 	}
 	l := 0
 	r := len(s) - 1
-	for r >= l {
+	for r > l {
 		if s[l] != s[r] {
 			return false
 		}
@@ -26,9 +26,12 @@ func isAlmostEcho(s string) bool {
 	}
 	l := 0
 	r := len(s) - 1
-	for r >= l {
-		if s[l] != s[r] && !isEcho(removeIndex(l, s)) && !isEcho(removeIndex(r, s)) {
-			return false
+	for r > l {
+		if s[l] != s[r] {
+			if !isEcho(removeIndex(l, s)) && !isEcho(removeIndex(r, s)) {
+				return false
+			}
+			return true
 		}
 		l++
 		r--
diff --git a/20201201/main_test.go b/20201201/main_test.go
index 51a055b..d70d64d 100644
--- a/20201201/main_test.go
+++ b/20201201/main_test.go
@@ -75,6 +75,11 @@ func Test_isAlmostEcho(t *testing.T) {
 			args{"abcbba"},
 			true,
 		},
+		{
+			"test6",
+			args{"abcdcbba"},
+			true,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {