[tag=RB] [lemma=an] [!□] □ □
[tag=RB] [lemma=an] [!□=□] □ □
[tag=RB] [lemma=an] [!(□ | □)] □ □
For example , if an action must be taken within ten calendar days but circumstances prevent doing so an extension may be requested ; however , the length of the extension could not exceed ten calendar days . so an object may participate in three perpendicular futures .. In the event of a failure for any reason to elect either or both of the said officers , or in case a vacancy shall occur in either of said offices for any reason , then an election may be held at any regular or special meeting , a notice of such election having been given in the notice of the call of the meeting . While every attempt is made to eliminate all possibility of error , occasionally an error may occur in the preparation of these position announcements . For example , if an action must be taken within 30 calendar days but circumstances prevent doing so an extension may be requested ; however , the length of the extension may not exceed thirty days . The good promoted is typically of an altruistic nature and thus an act may be supererogatory even if the overall good is not promoted ( as might be the case in extreme acts of self-sacrifice for the sake of another ) .