To distribute or arrange; to put in place.
To deal out; to assign to a use.
To eliminate or to get rid of something.
To incline.
To sort or arrange beforehand.
To order (goods or services) in advance, before they are available.
A binary relation that is reflexive and transitive.
An order for goods or services placed in advance.
Such that, recursively, the root is visited before the left and right subtrees.