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Step 2: Choose object need to copy > press Space.
Option 1: Displacement, when choose this option, base point is origin coordinate.
Option 2: Mode, when you choose this option, it will show two options, single or multiple. When you get single option, you only copy one time and the end command. When you choose multiple option, you can copy many objects until you is the end command.
Step 3: Choose base point.
Step 4: Choose point to copy to
If you want to repeat this command, you can press Space or click right of mouse