[Zeroglif]

var a = [1,1,2,3,4,4,1,5,1,6,1,1,7,1,1,7,1,1,7,1,1,1,8],
    i = a.length;
a.sort();
while (i--) {
    if (a[i] == a[i-1]) {
        a.splice(i, 1);
    }
}