If the intervals are readjusted for these frequencies, the entropy of the message would be 4.755 bits and the same NEUTRAL NEGATIVE ENDOFDATA message could be encoded as intervals [0, 1/3); [1/9, 2/9); [5/27, 6/27); and a binary interval of [0.00101111011, 0.00111000111).
If the intervals are readjusted for these frequencies, the entropy of the message would be 1.58 bits and you could encode the same NEUTRAL NEGATIVE ENDOFDATA message as intervals [0, 1/3); [1/9, 2/9); [5/27, 6/27); and a binary interval of [1011110, 1110001).