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* @progname listsour.ll
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* @author Hannu Väisänen
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Written by Hannu Väisänen, 1 May 1997.
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traverse (root(p), node, i) {
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if (eqstr(tag(node), "SOUR")) {
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if (reference(value(node))) {
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if (not(lookup(sour, value(node)))) {
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insert (sour, save(value(node)), 1)
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set (n, dereference(value(node)))
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tag(m) " " value(m) "\n"