knows(clarence, smalgyx).
knows(ulla, danish).
knows(imke, german).
knows(j_m, french).
knows(tor, norwegian).
knows(jane, nandi).
knows(david, lardil).
knows(clarence, english).
knows(ulla, english).
knows(imke, english).
knows(j_m, english).
knows(tor, english).
knows(jane, english).
knows(david, english).
