If the same logic is truly needed for both instances, then:

* in an `if` chain they should be combined

[source,{language},diff-id=1,diff-type=compliant]
----
if ((a >= 0 && a < 10) || (a >= 20 && a < 50)) { // Compliant
  doFirstThing();
  doTheThing();
}
else if (a >= 10 && a < 20) {
  doTheOtherThing();
}
else {
  doTheRest();
}
----

* for a `switch`, one should fall through to the other

[source,{language},diff-id=2,diff-type=compliant]
----
switch (i) {
  case 1:
  case 3: // Compliant
    doFirstThing();
    doSomething();
    break;
  case 2:
    doSomethingDifferent();
    break;
  default:
    doTheRest();
}
----