public boolean isEverywhere(int[] nums, int val) {
  for (int i = 0; i < nums.length-1; i++) {
    int n1 = nums[i];
    int n2 = nums[i+1];
    boolean isPair = (n1 == val || n2 == val);
    if (!isPair) {
      return false;
    }
  }
  return true;
}