We evaluate the inclusive semileptonic B decay spectrum as a function of the
final-state hadrons energy to second order in the inverse quark mass expansion
and tree level in αs. We argue that there is an energy interval below
the c production threshold that could be used to determine Vub.Comment: 10 pages, UCLA/94/TEP/10. (LaTeX file, one uuencoded PostScript
figure appended at the end.