var alpha = $(".a").stream('click').map('alpha');
var betta = $(".b").stream('click').map('betta');
var gamma = $(".c").stream('click').map('gamma');
var result = alpha.sync(betta, gamma).map('Synced');
var status = alpha.take(1).merge(betta.take(1), gamma.take(1)).reduce('Already clicked: ', function(a, b){
return a + " " + b;
});
result.bindTo($("#result"), "html");
status.bindTo($("#status"), "html");