81.   No official explanation was given for the change in schedule.

82.   No official explanation was immediately given.

83.   Nonetheless, questions persisted about the official explanation, because the department cleared the editorial only after the memo recommending its disapproval was leaked to the media.

84.   No official explanation was given, but the move could be intended to improve security.

85.   No official explanation was given, but the resignations were widely seen as linked to the debt default.

86.   Official explanations for the poisoning range from excessive amounts of nitrates presumably used in fertilizer to poisonous fumes released by scavengers burning plastic insulation off copper cables.

87.   No official explanation was forthcoming.

88.   No official explanation was given.

89.   No official explanations were given, but North Korea reportedly refused to discuss the issue.

90.   No official explanation for the crash has been given.