Its backbone N bonds with the backbone O of Phe-10 and its bacbone O
with the backbone N of Val 12. In Parallel strands the H-bonds are always
from one residue to two different ones that are two appart.
Some students ask if these H-bonds are less favourable than the ones
in the antiparallel strands. They are not. H-bond energy is determined
mainly by distance and to a lesser extend by the angles.