have no idea (what/who/when/where/why/whether/if/...)

Examples:

1. Until you try these goggles on, youfll have no idea what youfve been missing..

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2. After waiting for a half hour, I gave up. They still have my computer, I have no idea when
it'll be ready.

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3. I would like to try this, but I have no idea where to start. Does anyone have an idea?

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4. I have no idea whether it even works or not.

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