The husk and stray are counted as sub-variants of existing mobs as opposed to entirely new mobs, hence why you are unable to simply type /summon Stray or /summon Husk. There was supposed to be spawn eggs for them, but it seems they were removed either intentionally or by accident in the final release.
Axiomatic method, in logic, a procedure by which an entire system (e.g., a science) is generated in accordance with specified rules by logical deduction from certain basic propositions (axioms or postulates), which in turn are constructed from a few terms taken as primitive.
Python Methods. In the simplest term a method is a function inside of an object. You can pass attributes (variable inside a method) to the class and method that will get processed inside of the method and independently for each object. Variables or attributes defined or initialized at the beginning of the class are inherited to the methods inside that class. We will see in the examples.