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  • Here's a very similar question: stackoverflow.com/questions/432112/… Commented Jun 1, 2017 at 18:59
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    "a) what this means" - have you read that extract from the docs you posted here? Commented Jun 1, 2017 at 19:00
  • @ForceBru Yes, and it didn't help much. Commented Jun 1, 2017 at 19:02