  We present a systematic study of the stability of nineteen different periodic
structures using the finite range Lennard-Jones potential model discussing the
effects of pressure, potential truncation, cutoff distance and Lennard-Jones
exponents. The structures considered are the hexagonal close packed (hcp), face
centred cubic (fcc) and seventeen other polytype stacking sequences, such as
dhcp and $9R$. We found that at certain pressure and cutoff distance values,
neither fcc nor hcp is the ground state structure as previously documented, but
different polytypic sequences. This behaviour shows a strong dependence on the
way the tail of the potential is truncated.
