global void execute (Database.BatchableContext BC, List<Contact> scope){
 List<Contact> ctlist = [select id, Name, Member_Type__c,CreatedDate from Contact where ID NOT IN (SELECT Contact_Name__c from Preference_Center__c) and Member_type__C =:'RM - Regular Member'];
        List<Preferences__c> msi = [select id,Name,Is_deprecated__c from Preferences__c
               where Is_deprecated__c = false and (Default_Preference__c = 'Member Only'
               or Default_Preference__c = 'Both')];

        List<Contact> searchResults = new List<Contact>();

            // Each loop processes 200 items

        List<Preference_Center__c> pclist = new List<Preference_Center__c>();

        for(Contact c : ctlist){
            for(Preferences__c pf : msi){
                Preference_Center__c pc = new Preference_Center__c();
                pc.Marketing_Subscription_Item__c = pf.Id;
                pc.Contact_Name__c = c.id;
                pclist.add(pc);
                system.debug('list before loop' +pclist);
            }
        }
   system.debug(pclist);


    }