the same time, on a perusal of the written statement filed by the first respondent, it has clearly come out that all the factual foundation, contending full facts for invoking waiver have been pleaded in paragraphs 9 and 10. At the same time, after pleading necessary facts, which can certainly invite 'waiver', in the last sentence of paragraph 10, it has been stated that, 'therefore, the suit is hit by the principle of estoppel'. What are required to be pleaded are facts and not law. If factual foundation is there, it is the duty of the court to apply law, and parties are not expected to plead law. When paragraphs 9 and 10 in detail contain all the facts to invite the doctrine of waiver, the fact that the party has chosen to treat it as estoppel is of no consequence. Matters being so, if at all any rights or interests were created in favour of the appellants through Ext.A1 in respect of Pullad property, it is evident that they had intentionally waived the right to claim such rights or interests over the Pullad property.