Take two entries from an array which are never the same entry

nonoverlapping_random.js

function get_two_random_elements() {
    let indexA = (   Math.floor(Math.random() *  data.length   ) )  
    let indexB = (  (Math.floor(Math.random() * (data.length-1)) + indexA + 1) % data.length ) 
    console.log(
      `${indexA}: ${data[indexA]}, ${indexB}: ${data[indexB]}`, 
      indexA == indexB ? "SAME" : "ok", 
      data.length
    )
}

/*

test:
let data = ["A", "B", "C", "D", "E", "F"]
for(let i = 0; i!= 100; i++){ get_two_random_elements() }

output:
0: A, 2: C ok 6
5: F, 4: E ok 6
4: E, 3: D ok 6
2: C, 3: D ok 6
0: A, 1: B ok 6
3: D, 0: A ok 6
2: C, 4: E ok 6
0: A, 4: E ok 6
1: B, 4: E ok 6
2: C, 1: B ok 6
0: A, 1: B ok 6
4: E, 3: D ok 6
2: C, 1: B ok 6
0: A, 5: F ok 6

*/