Possible Clues:

• Julianne and Demi
• Demi and Dudley
• Poet Marianne and actress Julianne
• Roger and Demi
• Michael, Mandy and Roger
• Roger and Julianne
• Mandy and Dudley, for two
• ___ law, principle stating that computer processing power doubles every 18 months
• -- law (computer industry rule)
• Marianne and Julianne