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Extension Kits - ClassicThere are 3 products.

Extension Kits - Classic
These kits take the Classic main sets up one level.
For example, the 2a kit extends the Classic no.2 set to the no.3 set.
This allows you to start with a smaller, less costly set. Once your child is ready for a greater challenge, you simply upgrade to the next level.
Note that the 3a kit is currently the only way to get to a Classic no.4 set (3+3a=4).