In my first lab I used a microscope to observe onion cells.
(I; used; a microscope; to observe onion cells; L:In my first lab) Context(I used,List([16, 22))):(I; used a microscope to observe; onion cells)
I used,List([16, 22))
I I
used used a microscope to observe
a microscope to observe onion cells L:In my first lab
onion cells