Multiple superclasses require sophisticated precedence computations.

Any nonoptional argument class can help to select a method.

Defmethod is used for defining the method.

Each collection of methods that share the same name is called a generic function.

Common Lisp Object System makes it possible to define generic functions.

Progressive envelopment helps you to write procedures on building complicated things incrementally.

Let is like shorthand notation for nested LETs.

Because of this condition, it will report an unbound variable error.

Parameter list consists of two-elements lists, each of which has a parameter variable and an intial value form.

LET arranges for parameters to be bound, just as parameter are bound on entering a procedure.

The backquote mechanism will simplify template filling.

The backquote mechanism simplifies macro writing.

The elements in the list are spliced into the list when the @ appears.

The backquote mechanism is perfect for making and filling macro templates.

The normal quote, ' isolates an entire expression from evaluation.

Backquote mechanism makes it easy to create and to complete template like expressions in which only a few, variable details to be filled.

Initial-Contents keyword along with the desired intial elements wrapped up in an array.

Setf is writer procedure and aref is reader procedure for arrays.

The array can be constructed and its dimension can be set by using make-array.

The nails symbol indicates the first bin, the one with an index of 0 holds nails.