Assertion: tree's node | /r/HasProperty | a 2-node
Facets:
Source sentences:
text: We say that an internal node is a 2-node if it has one data element and two children.
text: Every internal node is a 2-node or a 3-node.
text: We say that an internal node is a 2-node if it has one data element and two children.
text: Every internal node is a 2-node or a 3-node.