Because of the limitations, we sometimes cannot list all patterns and dimensions.
If you can not add your desired pattern/dimension to your cart. Just select any available pattern with your desired dimension.
Then add your original order as a note on cart page.
Example: You want to order Pattern: 9 with 18x18 inch dimension but cannot see them available to add. In order to place your order, just buy Pattern:1 with 18x18 inch dimension and then add a note on Cart Page: "I bought Pattern: 1 but I want Pattern: 9 with 18x18 inch dimension"