Numeric URL paths and Class names

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Might have shot myself in the foot here.

I have a "page" with sub-pages which gives me a URL like this;

/2com/calculator
/2com/about

"Calculator" is a single page with a controller, but you can't have a Class name beginning with number!

What's the solution?

I tried adding the page somewhere and aliasing it, but I really need the URL to be /2com/calculator

Any thoughts?

moth