Char size | 35 bit word       | 36 bit word
----------+-------------------+-------------------
    6-bit | 5 + 5 bits unused | 6 + 0 bits unused
    7-bit | 5 + 0 bits unused | 5 + 1 bit unused
    8-bit | 4 + 3 bits unused | 4 + 4 bits unused