Rick Astley and Ciphers

‘GIVE NEVer you DESERT TELL AND Gonna NEVer NEVER DESERT LET you’

If you are of a certain age, you will remember this song:

Yes, it sticks in our head, and you will remember for as long as you live (possibly). Many people perhaps want to forget it, but it’s so difficult. But for a cipher, we want a code which is memorable, let’s create the Rick cipher, and layout the words as a cipher:

'A': "NEVER", 
'B': "GONNA", 
'C': "GIVE", 
'D': "YOU", 
'E': "UP", 
'F': "Never", 
'G': "Gonna", 
'H': "LET", 
'I': "You", 
'J': "DOWN", 
'K': "NEver", 
'L': "GOnna", 
'M': "TURN", 
'N': "AROUND", 
'O': "AND", 
'P': ["DESERT", "DESSERT"],                                 
'Q': "YOu", 
'R': "NEVer", 
'S': "gonna", 
'T': "TELL", 
'U': "A", 
'V': "LIE", 
'W': "and", 
'X': "HURT", 
'Y': "you",                                 
'Z': "rick", 
' ': "+", '.': ".", '\n': "\n",                                 
'0': "0", '1': "1", '2': "2", '3': "3", '4': "4", '5': "5", '6': "6", '7': "7", '8': "8", '9': "9"