(b) The type of energy or commodity that is the source of the heat produced by the primary heating system in the residence of the applicant;
(The type of energy or commodity; is; the source of the heat) (the heat; produced; by the primary heating system in the residence of the applicant) (the source; is The type of; energy or commodity that) (that; is the source of; the heat)
The type of energy or commodity the heat the source that
is produced is The type of is the source of
the source of the heat
by the primary heating system in the residence of the applicant
energy or commodity that
the heat