Yes, I can provide the link to the law:
http://exchanges.state.gov/education/jexchanges/about/22CFR62.pdf
Home-country physical presence re-quirement
means the requirement that
an exchange visitor who is within the
purview of section 212(e) of the Immi-gration
and Nationality Act (substan-tially
quoted in § 62.44) must reside and
be physically present in the country of
nationality or last legal permanent
residence for
an aggregate of at least
two years following departure from the
United States before the exchange vis-itor
is eligible to apply for an immi-grant
visa or permanent residence, a
nonimmigrant H visa as a temporary
worker or trainee, or a nonimmigrant
L visa as an intracompany transferee,
or a nonimmigrant H or L visa as the
spouse or minor child of a person who
is a temporary worker or trainee or an
intracompany transferee.
See where it says "aggregate"??? It does not say "continuous".
and again:
until is established that
such person has resided and been phys-ically
present in the country of his na-tionality
or his last legal permanent
residence for an aggregate of at least
two years following departure from the
United States.