Scaffolds ought to never be set up or taken down over people or active pavements. http://www.complang.tuwien.ac.at/cti/cgi/cti?texta=:-+nti:nonterminating_goal(turing(t(%5b%5d%81a%27+%27%81a%5b%5d)%81as0%81a%5bp(s0%81a%27+%27%81as1%81a%27+%27%81ar)%81ap(s1%81a%27+%27%81as0%81a%27+%27%81al)%5d%81ay)).&tna=yes&nti=yes&skipcomp=&url=http%3a%2f%2fwww.mapleprimes.com
