function lookForDistinctSequence(sequenceSize) {
if (new Set(dataset.slice(0, sequenceSize).split("")).size === sequenceSize)
return sequenceSize;
let startIdx = 1;
while (startIdx < dataset.length) {
let checking = new Set(
dataset.slice(startIdx, startIdx + sequenceSize).split("")
);
if (checking.size === sequenceSize) return startIdx + sequenceSize;
startIdx++;
}
return startIdx;
}