A possible 6th machine may or may not exist.

Those causes were all real, and the machine actually existed.

Even if other machines of my type still exist in the, universe, I could not reach them with the thought amplifier.

The result is that if a virtual machine exists for a real one, Java programs should be able to run on it.

This machine existed for two years before Xerox decided to market it.

Such a machine exists, and it's called a digital video recorder.

It may well be that no machine exists there.

Every machine we possess existed at the beginning of our history, and many had disappeared long before it started.

Such machines now exist and cost $4,000 to $6,000.

We had no idea such machines existed, although apparently they have been around for a decade.