function split(w){
let hex1 = '';
let hex2 = '';
for (let i = 0; i < w.length; i++){
let t = parseInt(w[i],16);
let y = 0;
if (t === 0) {
hex1 += "f";
hex2 += "1";
continue;
}
if (t < 8) {
hex1 += (t*2 - 1).toString(16);
hex2 += (t*2 + 1).toString(16);
} else {
if (t%2 == 0) {
hex1 += (t/2 +1).toString(16);
hex2 += (t/2 -1).toString(16);
} else {
hex1 += ((t + 1)/2).toString(16);
hex2 += ((t - 1)/2).toString(16);
}
}
};
return [hex1 , hex2];
}