nly use 4 bits for the category and mask bceause that&apos;s all we needed, however L&#xD6;VE supports up to 16 bits for the category and bitmask (<code>0000000000000000</code>).
The <em>group</em> property isn&apos;t used and should be set to 0 when it isn&apos;t.
We haven&apos;t mentioned groups before because if you know how to use categories and bitmasks then you don&apos;t need to use groups as categories and bitmasks offer a more powerful way of doing the same thing.
That being said, collision groups 