diff --git a/passphrase/calc.py b/passphrase/calc.py
index <HASH>..<HASH> 100644
--- a/passphrase/calc.py
+++ b/passphrase/calc.py
@@ -50,10 +50,6 @@ def entropy_bits(
     # Some NumPy replacements
     counts = [lst.count(x) for x in lst]
     probs = [c / n_lst for c in counts]
-    n_classes = len([x for x in probs if x != 0])
-
-    if n_classes <= 1:
-        return 0.0
 
     # Compute entropy
     entropy = 0.0
Remove unused code from calc

That piece of code was not being used, and the condition never
reached: for `n_classes` to be <=1, `probs` had to be just 1
element because no element could ever be 0, given that each
element is a quotient, and the dividend is never 0. And for
`probs` to be just 1 element, `counts` should also be, which is
prevented by a previous check.