diff --git a/solutions/02.ts b/solutions/02.ts
index bdeaa01..e7c60a8 100644
--- a/solutions/02.ts
+++ b/solutions/02.ts
@@ -14,7 +14,7 @@ class DayTwo implements Solvable {
             while (j < levels.length) {
                 // is unsafe if ascent / descend bigger than 3 or smaller than 1
                 const diff = Math.abs(levels[i] - levels[j])
-                if (diff > 3 && diff < 1) {
+                if (diff > 3 || diff < 1) {
                     return false
                 }
                 // calculate positive or negative gradient
@@ -22,10 +22,7 @@ class DayTwo implements Solvable {
                     gradients.push("ascending") 
                 } else if (levels[i] > levels[j]) {
                     gradients.push("descending")
-                } else {
-                    return false
-                }
-                i++
+                }                i++
                 j++
             }
             // is safe and constant gradient?