<formula>IF(ISBLANK( Related_Opportunity1_ID__c ), "", "1") & IF(ISBLANK( Related_Opportunity2_ID__c ), "", "2") & IF(ISBLANK( Related_Opportunity3_ID__c ), "", "3") & IF(ISBLANK( Related_Opportunity4_ID__c ), "", "4") & IF(ISBLANK( Related_Opportunity5_ID__c ), "", "5")</formula>
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