Define an operation $\Diamond$ as $ a \Diamond b = 12a - 10b.$ Compute the value of $((((20 	\Diamond 22) 	\Diamond 22) 	\Diamond 22) 	\Diamond22).$
1. First, we need to compute \( 20 \Diamond 22 \). By the definition of the operation \(\Diamond\), we have:
   \[
   20 \Diamond 22 = 12 \cdot 20 - 10 \cdot 22
   \]
   Calculating the values:
   \[
   12 \cdot 20 = 240
   \]
   \[
   10 \cdot 22 = 220
   \]
   Therefore:
   \[
   20 \Diamond 22 = 240 - 220 = 20
   \]

2. Next, we need to compute \((20 \Diamond 22) \Diamond 22\). Since \(20 \Diamond 22 = 20\), we have:
   \[
   (20 \Diamond 22) \Diamond 22 = 20 \Diamond 22
   \]
   From the previous calculation, we know:
   \[
   20 \Diamond 22 = 20
   \]

3. Now, we compute \(((20 \Diamond 22) \Diamond 22) \Diamond 22\). Again, since \((20 \Diamond 22) \Diamond 22 = 20\), we have:
   \[
   ((20 \Diamond 22) \Diamond 22) \Diamond 22 = 20 \Diamond 22
   \]
   From the previous calculation, we know:
   \[
   20 \Diamond 22 = 20
   \]

4. Finally, we compute \((((20 \Diamond 22) \Diamond 22) \Diamond 22) \Diamond 22\). Since \(((20 \Diamond 22) \Diamond 22) \Diamond 22 = 20\), we have:
   \[
   (((20 \Diamond 22) \Diamond 22) \Diamond 22) \Diamond 22 = 20 \Diamond 22
   \]
   From the previous calculation, we know:
   \[
   20 \Diamond 22 = 20
   \]

Thus, the value of \((((20 \Diamond 22) \Diamond 22) \Diamond 22) \Diamond 22\) is \(20\).

The final answer is \(\boxed{20}\).