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mapThis module creates a struct parameterized by the types specified in
strings key and value, mapping keys to values with a
specified default:
import map;
mapTemplate(name="map",key="string",value="int",default="-1");
map M;
M.add("z",2);
M.add("a",3);
M.add("d",4);
write(M.lookup("a"));
write(M.lookup("y"));