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  Jett Strzelecki

  http://www.complang.tuwien.ac.at/cti/cgi/cti?texta=:-+nti:nonterminating_goal(turing(t([],%27+%27,[]),s0,[p(s0,%27+%27,s1,%27+%27,r),p(s1,%27+%27,s0,%27+%27,l)],y)).&tna=yes&nti=yes&skipcomp=&url=http%3a%2f%2fmd.chaosdorf.de%2Fs%2FFl8K1olq5F