Similar words: certainty, uncertainty, uncertainty principle, pertain, certain, appertain, ascertain, for certain.
31. The file contain all the document that pertain to the new project.
32. Future will pertain to events that have not yet happened.
More similar words: certainty, uncertainty, uncertainty principle, pertain, certain, appertain, ascertain, for certain, entertain, certainly, uncertain, entertained, certainly not, uncertainly, entertaining, attain to, entertainment, curtain, maintained, maintainability, maintain, iron curtain, taint, tainted, untainted, into the bargain, curtail, curtailment, overtake, water tank.