Select players with empty inventory slot

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Is it possible to testfor
players with a specific inventory slot (more specific the 100th/boots slot) if it is empty. I have tried
/testfor @a {Inventory:[{Slot:100b}]},
and
/testfor @a {Inventory:[100:{}]}
and
/testfor @a {Inventory:[{Slot:100b,id:"minecraft:air"}]}
but none of them work.
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How do you clear specific inventory slots in Minecraft?
There is no way to remove items if they are moved with the cursor, as far as I am aware, due to the fact that it doesn't have a slot id. However clearing all other slots of a specific item and killing all dropped items is possible, using /replaceitem .How do you know if a Minecraft slot is empty?
If a dropper slot is empty it means the corresponding compound tag with property Slot does not exist. Use /execute unless data to check if the slot is empty: execute unless data block 12 23 34 Items[{Slot:0b}] run ... Is it possible to check multiple slots in a single command by using an "execute unless ...Get Selected Inventory Slot - Minecraft 1.8
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