The second number refers to a specific variation.

The Stonewall is a system White sets up, rather than a specific variation.

Many regions have their own specific variation on the miso standard.

In Ontario, the specific variation is identified by a letter/number suffix after the name.

They are also examples of Systems, rather than specific opening variations.

Peking opera boasts 15 basic facial patterns, but there are over 1000 specific variations.

It should also state the specific variations required in terms of concentration, format, appearance etc.

The third was a specific variation of the two together.

Each province follows a similar pattern but with specific variations.

Some specific variations exist, which vastly alter the strategy used from the above description.