Therefore, it may be possible for a fairly simple model to explain total and unit cost differences between posts.
There is no need for a complex model for explaining cost differences between posts.
The cost differences between posts require a very intricate model for explaining them.
A girl is holding a kitten.
Lincoln glared and then spoke.
Your weather is very different.
This makes me happy.
It's damaging to spend too much time thinking about it.
The runner is Canadian