How to use the /clear command correctly?

So the syntax of the command is:

clear [player] [item] [data] [max-count] [dataTag]

So if you wanted to clear your own inventory you would say:

/clear

If you wanted to clear rappatic's inventory:

/clear rappatic

If you wanted to clear rappatic's inventory of stone blocks:

/clear rappatic minecraft:stone

If you wanted to clear rappatic's inventory of blue wool (here for data values)

/clear rappatic minecraft:wool 11

or for all types of wool:

/clear rappatic minecraft:wool -1

To clear rappatic's inventory of 12 stone blocks:

/clear rappatic minecraft:stone 1 12

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