Possible Clues:

• 'Assuming it's true ...,' informally
• "Jes' think ..."
• Informal "What if ... "
• Tex's "What if ..."
• Let's say, informally
• "What if," in the boonies
• Reckon, rurally
• "Jes' imagine, Jeb ..."
• Imagine, slangily
• Quickly imagine?