Hello there. It´s been some time since i bought this, so this is the first time i´ve really tried using it. Most of it is really self explanatory, but i´ve run into some problems. I´m trying to make an outside tile set. There´s A1, A2, A5a and A5b. But is there no A3 and A4? Without walls and buildings it´s a bit difficult making something. I´m pretty sure i´m just missing something obvious, but right now i´m a bit stumped.