  In this paper, we prove that for a given biquaternion algebra over a field of
characteristic two, one can move from one symbol presentation to another by at
most three steps, such that in each step at least one entry remains unchanged.
If one requires that in each step two entries remain the same then their number
increases to fifteen. We provide even more basic steps that in order to move
from one symbol presentation to another one needs to use up to forty-five of
them.
