JSFiddle - React, Tailwind, and code Playground

JavaScript

alert(uniq ([
	[1,2,3,4,5,1],
	[90,7,2],
	[3,4,5,10]
]))

function uniq (arr) {
	let c = 0;
  for (let a of arr) {
  	c += a.length
    for (let v of a) {
    		let x = 0
    		n: for (let b of arr) {
          	let r = 0
          	for (let i of b) {
          		if (i === v) {
              	if (x < 2) c--
              	x++
           			if (a === b && (++r) < 2) c++
            	}
            	if (r > 2) continue n;
          	}
        }
    }
  }
	return c;
}