Related Clues:

• 'Cogito, -- sum': Descartes
• Conclusion beginning
• ''Then what happened?''
• Logical lead-in
• '... ___ it goes'
• Billy Joel's "__ It Goes"
• Deducer's word
• 'Thus ...'
• Sum lead-in
• 'Consequently...'
• Logician's connector
• "Cogito ___ sum"
• __ forth (et cetera)
• 'And so ...'
• Thus, in mathematical proofs