Possible Clues:

• "Weather permitting" et al.
• ''No ___, ands or buts''
• No --, ands or buts
• Could-go-either-way factors
• "While supplies last" and others
• ''Weather permitting'' et al.
• Contingent factors
• ". . . ___ and buts were candy and nuts"
• Suppositions, may be accompanied by buts
• Unpredictable factors