Many rules are identical to others but for some string constant, for example: - [x] Collection methods: `$div.hide()`, `$div.find()`, `$div.parent()` ... - [x] Collection properties: `$div.selector`, `$div.context` ... - [x] Utilities: `$.isFunction()`, `$.isNumeric()`, `$.contains()` ... - [x] Utility properties: `$.noop`, `$.browser`, `$.boxModel` ... - [x] Combined methods and utilites: `$.each` + `$div.each()`