(c)
2
such a sentence;
was on at least 2 of those 3
previous occasions sentenced to a
custodial sentence; and
(a)
was on at least one of these 3
previous occasions sentenced to not
less than 2 years' imprisonment,
then, if the court is satisfied that it is
expedient for the protection of the public that
he should be detained in custody for a sub-
stantial time, the court may pass, in addition
to any other sentence imposed for the present
offence, a sentence of preventive detention
for such term of not less than 5 nor more than
14 years, as the court may determine.
(Cap. 234.)
(2) A sentence of preventive detention
shall commence after the expiry of any sentence
of imprisonment imposed for the present offence.
(3) A person sentenced to preventive
detention shall be detained in an institution
for the term of his sentence, and while so
detained shall be treated in such manner as may
be prescribed by rules which may be made under
the Prisons Ordinance as if such institution
were a prison.