PHP MLM Binary Tree observation

Thanks for your work on the package.
I am working on a project to allow a user to register and refer 3 other people and each of the 3 people will refer 3 other people and it continues like that.
when I use this package to view the tree it displayed a parent with only 2 children each only even if a parent refer 3 children.
Does your package support what I want?
If it does, how do I resolve it.
Thanks.

$mlm->matrix = 2;
change---------------
$mlm->matrix = 3;