How to set snap to multiple elements

I have set my snap element of the draggable like so: ``` $('#id_num_'+id_num).draggable({snap:'.time_column', snapMode:'inner'}) ``` How do I set up my draggable element to snap to two different elements or classes...like so: ``` $('#id_num_'+id_num).draggable({snap:'.time_column', '.**other class**', snapMode:'inner'}) ```