Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: Enter this code for 10 free Lyfts PARX #Isn't it great to save money when you shop? #blissful #FREECAB
This tweet contains emotions: 
joy, optimism