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function prepare_timestamp_array_for_request(a,limit){if(!limit){limit=100}
var rv='';if(a.length>0){var random_starting_point=Math.max(0,Math.floor(Math.random()*a.length-limit));for(var i=0;i<limit&&i<a.length;i++){rv+=a[random_starting_point+i][0];if(a[random_starting_point+i].length>=2){rv+=","+a[random_starting_point+i][1]}
rv+=";"}}
return rv}
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