Replacing last few bits for huffman encoding using LSB

'11100001000' Now I want to change the last 4 bits for the first value

3 bits for the second value

1 bit for the third value depending on the count of the bits I need

'11100001001' to replace.

'11100001010'

'11100001011'

'11100001100'

'11100001101'

'11100001110'

'11100001111'