Puzzle 75: C is silent
19 April 2017
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From New Scientist #1126, 26th October 1978 [link]
The four tribes seem now, for better or worse, to be firmly established on the Island of Imperfection. They are the Pukkas, who always tell the truth; the Wotta-Woppas, who never tell the truth; the Shilla-Shallas, who make statements which are alternately true and false or false and true; and the Jokers, whose rules for truth-telling in making three statements are any rules that are different from those of any of the other three tribes.
In the story which I have to tell about A, B, C and D there is one member of each tribe. C, I am afraid, does not actually say anything. Can he just be fed-up? I don’t blame him. The other three speak as follows:
A: B is a Pukka;
B: C is a Shilla-Shalla;
D: A is a Pukka;
D: I am a Shilla-Shalla or a Wotta-Woppa;
D: B is a Joker.
Find the tribes to which A, B, C and D belong.