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Journey to Planet Biplantar

One time Spock, the space traveler student of logic, came to the planet Biplantar. On this planet, as in many others visited by Spock, the whole population is divided into two groups: the truthful and the liars. The strictly true only makes statements true while lying only make false claims.

On this planet, in addition, every house has two floors, which, in a display of imagination, call lower and upper . In one plant (may be lower or higher may be, it depends on each home) live only true to the other plant, of course, live only liars. This does not mean that each is confined to a specific plant, as if they were prisoners. By contrast, those living in a plant can freely visit the other, but "live" (Moran, overnight, live) only one of two.

In villages or small towns the houses are of simple structure and any visitor always knows what floor of the house is. In large cities, however, houses may have a very complex structure, labyrinthine would say, with false steps that seem to lead to plants lacking, false windows with landscapes (gardens created by artificially high or games of mirrors), false doors and other traps for the collection so that, after a transit time for their rooms, visitors can lose track of if you are in the lower or higher (although the resident never lost and always knows where you are).

On his first day on the planet Biplantar, Spock was in a house in a small town. He had arrived an hour or two, but still had no idea who lived on each floor. At that time he saw a resident (who lived in that house, though not necessarily on the ground where they met) and after greeting him, Spock asked which group (ie, whether it was truthful or lying). The native replied:

If I said: "If there is a floor above us then I live in it", then you could deduce which group I belong.

Spock deduced from this information immediately on what the true and living plant which plant, liars. Maybe other things concluded, perhaps not. (But note that the fact that Spock has enough information to make a certain deduction does not necessarily mean that we also have.)

The questions are: Does native spoke to Spock was truthful or a liar ? What floor of the house were the two, the upper or lower? Which of the two plants lived truthful?

For each question, the challenge is either to answer or demonstrate that the information you have is insufficient to give an accurate answer.

Have fun ...