if (neighborhood.containsCell(c)) {
addProblemToken(CAProblemToken.VALUE_OUT_OF_RANGE,
(LEFT_BRACE4 != null ? LEFT_BRACE4.getTokenIndex() : 0),
"Cell already in neighborhood.");
} else {
neighborhood.addCell(c);
}
} catch (IllegalArgumentException e) {
}
}
l.clear();