Thunno, \$ 6 \log_{256}(96) \approx \$ 4.94 bytes
ez1scm
Explanation
ez1scm # Implicit inpute # Map: sc # Count of each in z1 # Second input m # Minimum # Implicit output
ez1scm
ez1scm # Implicit inpute # Map: sc # Count of each in z1 # Second input m # Minimum # Implicit output