diff --git a/lesson_06/expression/.env.test b/lesson_06/expression/.env.test
index 56cf4a06f..9fd9f468b 100644
--- a/lesson_06/expression/.env.test
+++ b/lesson_06/expression/.env.test
@@ -1 +1 @@
-HW_VERSION=your assigned version here
\ No newline at end of file
+HW_VERSION=E
\ No newline at end of file
diff --git a/lesson_06/expression/src/expression_calculator.ts b/lesson_06/expression/src/expression_calculator.ts
index 76b215c42..9d2e34663 100644
--- a/lesson_06/expression/src/expression_calculator.ts
+++ b/lesson_06/expression/src/expression_calculator.ts
@@ -2,10 +2,23 @@ export class ExpressionCalculator {
   /** Returns a calculation involving a, b, c, d, and e */
   calculate(a: number, b: number, c: number, d: number, e: number): number {
     // Implement your code here to return the correct value.
-    return 0;
+    // Function to implement: Math.pow((a + b) / c, d) * e
+    return this.multiply(this.pow(this.divide(this.add(a, b), c), d), e);
   }
 
   pow(base: number, exponent: number): number {
     return Math.pow(base, exponent);
   }
+  add(a: number, b: number): number {
+    return a + b;
+  }
+  multiply(a: number, b: number): number {
+    return a * b;
+  }
+  divide(a: number, b: number): number {
+    return a / b;
+  }
+  subtract(a: number, b: number): number {
+    return a - b;
+  }
 }
diff --git a/lesson_06/expression/src/wayleomvargas/abbreviation-validator.ts b/lesson_06/expression/src/wayleomvargas/abbreviation-validator.ts
new file mode 100644
index 000000000..047e9ccb7
--- /dev/null
+++ b/lesson_06/expression/src/wayleomvargas/abbreviation-validator.ts
@@ -0,0 +1,24 @@
+function isValidAlphaAbbreviation(word: string, abbr: string): boolean {
+    if (word.length < 1 || word.length > 25) return false;
+    if (abbr.length < 1 || abbr.length > 15) return false;
+    if (!/^[a-z]+$/.test(word)) return false;
+    if (!/^[a-z]+$/.test(abbr)) return false;
+    
+    let wordIndex = 0;
+    let i = 0;
+    
+    while (i < abbr.length && wordIndex < word.length) {
+        const ch: string = abbr[i];
+        
+        if (word[wordIndex] === ch) {
+            wordIndex++;
+            i++;
+        } else {
+            const skip: number = ch.charCodeAt(0) - 96;
+            wordIndex += skip;
+            i++;
+        }
+    }
+    
+    return wordIndex === word.length && i === abbr.length;
+}
\ No newline at end of file