trigger event when option selected in Sumoselect

Question

I am using sumoselect plugin for generating multi select drop down list. I have total 5 drop down list using this. Now i want to generate array for each options selected. each list should generate different arrays. How can i do this.

I have found this solution:

 $('.a').SumoSelect({triggerChangeCombined: false});
 $('.b').SumoSelect({triggerChangeCombined: false});
 $('.c').SumoSelect({triggerChangeCombined: false});
 $('.d').SumoSelect({triggerChangeCombined: false});
 $('.e').SumoSelect({triggerChangeCombined: false});

        $(".options li").bind('click', function(event, ui) {
        obj.push($this.val);
        });

It is applicable for all the list and generate single array. Can any one suggest me how can I specify perticular event of each dropdown list?

Also tried

        $(".a .options li").bind('click', function(event, ui) {
        if(obj1.index($this.val)<0)
        obj1.push($this.val);
        });

        $(".b .options li").bind('click', function(event, ui) {
        if(obj2.index($this.val)<0)
        obj2.push($this.val);
        });