JSFiddle - React, Tailwind, and code Playground

JavaScript

var array = [[1, 17], [1, 17], [1, 17], [2, 12], [5, 9], [2, 12], [6, 2], [2, 12]];

let result = array.filter((r={},a=>!(2-(r[a]=++r[a]|0))))
             
document.body.innerHTML=JSON.stringify(result);