Google Allo
Google Allo was an instant messaging mobile app by Google for the Android and iOS mobile operating systems , with a web client available on Google Chrome , Mozilla Firefox , and Opera . 
<triplet> Google Allo <subj> mobile app <obj> instance of <subj> Android <obj> operating system <triplet> Android <subj> mobile operating system <obj> instance of <triplet> iOS <subj> mobile operating system <obj> instance of <triplet> Google Chrome <subj> Android <obj> operating system