Update 3-24-18: 4. Just today the Nem account was updated with a new mosaic ico which informs us that You will receive Petro at the end of ICO. According to the white paper the ICO will end when the Petros of the first emission are exhausted.
The number of different tokens in control of the Venezuelan government is baffling. Why use four different tokens? I can't think of any other reason than to confuse and deceive.
By the way, the "petro presale transfer" token has mutable supply, which means the government is technically capable of printing it as fast and recklessly as they have printed the hyperinflationary bolívar.