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BEGIN {
int i, indent;
int seen[string];
void prInd (int cnt) {
for (i = 0; i < cnt; i++) printf (" "); }
}
BEG_G {
$tvtype = TV_prepostfwd; $tvroot = node($,ARGV[0]);
} N{
if (seen[$.name]) {
indent--;
if (indent == 0) exit(0);
} else {
prInd(indent); print ($.name);
seen[$.name] = 1;
indent++;
}
}
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