public function getPairsNumber($forceReload = false)
    {
        if (!$this->properties || $forceReload)
            $this->getProperties();
        return $this->properties->pairsNumber;
    }
public function getPairsNumber($forceReload = false)
    {
        if (!$this->properties || $forceReload)
            $this->getProperties();
        return $this->properties->pairsNumber;
    }
Return nb pairs used

@param bool $forceReload
@return integer