function contain_only_three_same_repeating_chars(s) {
var len = s.length;
if (len % 3 !== 0) {
return false;
}
for (var i = 0; i < len - 3; i++) {
if (s[i] !== s[i + 3]) {
return false;
}
}
return true;
}
var s = "pokpokpokpok";
if (contain_only_three_same_repeating_chars(s)) {
document.write("Yes");
}
else {
document.write("No");
}
/*
run:
Yes
*/