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function makePromiseToParty () 
{
    // Note all the `fn` [used in then( fn )] return a Promise instance
    
    return familyPlanner.inviteGuests()
                     .then( prepareSundayRoastDinner )
                     .then( serveDinner             )
                     .then( eatDinner                )
                     .then( cleanDishes              );
        
};