need help on how to encode words using huffman code

0 xxxxxxxx
| +- token code for N
+--- ESCAPE

ESCAPE:00
END-STREAM:01
N:1

0 xxxxxxxx 0 yyyyyyyy
             +- token code for E

ESCAPE:00
END-STREAM:01
N:10
E:11

0 xxxxxxxx 0 yyyyyyyy 11 0 zzzzzzzz
                      |    +- token code for D
                      +------ second E

ESCAPE:00
END-STREAM:011
N:010
E:11
D:10