Foundation
Cornerstone
There’s a stone, a tree, another tree, and a coat rack. That stone and two trees will make the perfect foundation, or cornerstone, for a house to put that coat rack in! This stone is flat and heavy and both of the trees are flexible and durable.
そ
いしずえ
None
After you finish the foundation, the only step that's left is to wash the entire thing with soap (そ).