Case 1:

SPEC: (first line)(second line
third line
last line)
SPEC: (second line)(third line
last line)
SPEC: (third line)(last line)
SPEC: (last line)()
SPEC: ()()
SPEC: ()()
SPEC: ()()
SPEC: ()()

=======

Case 2:

SPEC: (first line)(second line
third line
last line)
SPEC: (second line)(third line
last line)
SPEC: (third line)(last line)
SPEC: (last line)()
SPEC: (last line)()
SPEC: (last line)()
SPEC: (last line)()
SPEC: (last line)()