The variants of three which includes "not" basically alter the celebration from obtaining not to obtaining, but are usually exactly the same, and a similar solutions are offered. The plural version is much more widespread according to Google ngram. It is usually made use of for example in Cambridge's dictionary. https://top-advocate-in-karachi51574.ampedpages.com/family-lawyer-in-karachi-can-be-fun-for-anyone-63346645