怎么通过代码实现物品掉落不重复
<lootcontainer name=“AECSirenHeadBossLoot” count=“10” size=“7,3” sound_open=“UseActions/open_backpack” sound_close=“UseActions/close_backpack” open_time=“5” loot_quality_template=“qualPlus1Template” ignore_loot_abundance=“true”>
<item name=“drugPainkillers” count=“30,50” prob=“1” />
<item name=“medicalBloodBag” count=“30,50” prob=“1” />
<item name=“drinkJarPureMineralWater” count=“30,50” prob=“1” />
<item name=“resourceAcid” count=“30,50” prob=“1” />
<item name=“resourceGraphitePowder” count=“6000” prob=“1” />
<item name=“resourcePyroxylin” count=“6000” prob=“1” />
<item name=“resourceNitricAcid” count=“10000” prob=“1” />
<item name=“resourceSulfuricAcid” count=“10000” prob=“1” />
<item name=“casinoCoin” count=“15000,30000” prob=“1” />
<item name=“技能碎片” count=“20,50” prob=“1” />
让每个物品都出现一次 而不是一个物品有可能出现多次








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