Possible Clues:

• "__ to recall ..."
• '___ to recall...'
• '___ to recall …'
• '___ to remember ...'
• "... ain't quite as dumb as __": "How Long" lyric
• ''As __ to recall . . .''
• "___ to recall..."
• ''As ___ to recall . . .''
• '-- to recall ...'
• Buckminster Fuller's `__ to Be a Verb`