function cards() {
	var data = readJSON( fpath, opts );
	if ( data instanceof Error ) {
		throw data;
	}
	return data;
}
Returns an array of strings containing two or three letter abbreviations for each card in a standard 52-card deck.

## Notes

-   This function synchronously reads data from disk for each invocation. Such behavior is intentional and so is the avoidance of `require`. We assume that invocations are infrequent, and we want to avoid the `require` cache. This means that we allow data to be garbage collected and a user is responsible for explicitly caching data.

@throws {Error} unable to read data
@returns {StringArray} cards

@example
var list = cards();
// returns ['AC', '2C', '3C', ... ]