3 added 520 characters in body

# 05AB1E, 2423 21 bytes

Code:

u•éÓœ°D¥M™ù>•30B2ô0:g


Explanation:

u                      # Convert the input to uppercase.
•éÓœ°D¥M™ù>•30B       # Compressed version of CHDDFFNGLLPHRHTH.
It convert the text between the •'s from base 214 to
base 10 and converts that to base 30.
2ô     # Split into pieces of 2.
0:   # Replace each element that also occurs in the input by 0.
g  # Get the length of the processed input.


Uses the CP-1252 encoding. Try it online!

# 05AB1E, 2423 21 bytes

u•éÓœ°D¥M™ù>•30B2ô0:g


Uses the CP-1252 encoding. Try it online!

# 05AB1E, 2423 21 bytes

Code:

u•éÓœ°D¥M™ù>•30B2ô0:g


Explanation:

u                      # Convert the input to uppercase.
•éÓœ°D¥M™ù>•30B       # Compressed version of CHDDFFNGLLPHRHTH.
It convert the text between the •'s from base 214 to
base 10 and converts that to base 30.
2ô     # Split into pieces of 2.
0:   # Replace each element that also occurs in the input by 0.
g  # Get the length of the processed input.


Uses the CP-1252 encoding. Try it online!

2 added 14 characters in body

# 05AB1E, 242323 21 bytes

l’chddffngâÌhrhth’2ô0u•éÓœ°D¥M™ù>•30B2ô0:g


Uses the CP-1252 encoding. Try it online!Try it online!

# 05AB1E, 2423 bytes

l’chddffngâÌhrhth’2ô0:g


Uses the CP-1252 encoding. Try it online!

# 05AB1E, 2423 21 bytes

u•éÓœ°D¥M™ù>•30B2ô0:g


Uses the CP-1252 encoding. Try it online!

1

# 05AB1E, 24 23 bytes

l’chddffngâÌhrhth’2ô0:g


Uses the CP-1252 encoding. Try it online!