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BTW , its always a good idea to keep up w / your minutes used . You need a fairly good stream of substantial wins to keep up morale . Normally these vents are closed to keep out animals and moisture . The samplers are normally attached to the underside of a " frisbee " to keep out rain , and should be positioned about two metres above ground . While this is intended to keep out bugs and animals , it serves unconsciously as a mediator with nature , keeping its unpleasant aspects at a distance .