Let's say hypothetically that a country has already achieved several R&D breakthroughs and wants to get another. It rolls some number of paid-for "research dice," gets one or more 6's, and per the rules (p. 40), "you have successfully made a technological breakthrough." The country then chooses one of the two breakthrough charts, but when it rolls a single "breakthrough die" to determine which breakthrough it gets, the die roll indicates a breakthrough which the country has already achieved. In this case, does the country roll that single breakthrough die again (and potentially multiple times) until it hits a breakthrough on that chart that it has not already achieved, thus guaranteeing it some kind of breakthrough as a result of having gotten one or more 6's on its initial "research dice" throw? Or is the country simply out of luck -- it has duplicatively developed a breakthrough which it already had, and thus receives no fresh breakthrough whatsoever, despite having gotten one or more 6's on its initial "research dice" throw? I would be interested in knowing if there is a generally accepted rule of construction in such cases, and in particular whether the game designers have ever indicated their intent. The rulebook does not make it clear.