L=2 or more

[Midastouch]

How do I prevent WG from generating duplicate blocks, which it seems to do, whenever I use the L=2 such that 50% of my blocks are duplicates.

[lottoarchitect]

You can't prevent that. As a matter of fact, most of the time occurrence of duplicates is necessary to minimize the amount of blocks needed for L > 1. The driving force behind the engine is to maximize the overall coverage for a given L, if duplicates is what produces this, they will be used. I used to have an option to "force" no duplicates in the design, this resulted most of the time in inability to create L>1 wheels simply because of the necessity of these to be there to obtain 100% coverage for L>1. Depending on the construction, you'll either get lots or fewer duplicates.