array(9) {
  [0]=>
  object(Schedule)#1 (2) {
    ["start"]=>
    string(19) "2018-10-20 00:00:00"
    ["end"]=>
    string(19) "2018-10-20 00:15:00"
  }
  [1]=>
  object(Schedule)#2 (2) {
    ["start"]=>
    string(19) "2018-10-20 00:20:00"
    ["end"]=>
    string(19) "2018-10-20 00:35:00"
  }
  [2]=>
  object(Schedule)#3 (2) {
    ["start"]=>
    string(19) "2018-10-20 00:40:00"
    ["end"]=>
    string(19) "2018-10-20 00:55:00"
  }
  [3]=>
  object(Schedule)#4 (2) {
    ["start"]=>
    string(19) "2018-10-20 03:00:00"
    ["end"]=>
    string(19) "2018-10-20 03:15:00"
  }
  [4]=>
  object(Schedule)#5 (2) {
    ["start"]=>
    string(19) "2018-10-20 03:20:00"
    ["end"]=>
    string(19) "2018-10-20 03:35:00"
  }
  [5]=>
  object(Schedule)#6 (2) {
    ["start"]=>
    string(19) "2018-10-20 03:40:00"
    ["end"]=>
    string(19) "2018-10-20 03:55:00"
  }
  [6]=>
  object(Schedule)#7 (2) {
    ["start"]=>
    string(19) "2018-10-20 04:00:00"
    ["end"]=>
    string(19) "2018-10-20 04:15:00"
  }
  [7]=>
  object(Schedule)#8 (2) {
    ["start"]=>
    string(19) "2018-10-20 04:20:00"
    ["end"]=>
    string(19) "2018-10-20 04:35:00"
  }
  [8]=>
  object(Schedule)#9 (2) {
    ["start"]=>
    string(19) "2018-10-20 04:40:00"
    ["end"]=>
    string(19) "2018-10-20 04:55:00"
  }
}
TOTAL: 9



1 and 2 paired?: Yes
5 and 6 paired?: Yes
3 and 9 paired?: No