Table 2.

Twenty one possible direction

	Δxn	Δyn	∣Δrn∣
A	m	$-\sqrt{n}$	m2 + n
D	$\sqrt{n}$	m	m2 + n
S	$\sqrt{n}$	−m	m2 + n
G	m	$\sqrt{n}$	m2 + n
V	$m\sqrt{s_1}$	$\sqrt{s_{1}n}$	s1(m2 + n)
F	$m\sqrt{s_2}$	$\sqrt{s_{2}n}$	s2(m2 + n)
P	$m\sqrt{s_3}$	$\sqrt{s_{3}n}$	s3(m2 + n)
M	$m\sqrt{s_4}$	$\sqrt{s_{4}n}$	s4(m2 + n)
I	$m\sqrt{s_5}$	$\sqrt{s_{5}n}$	s5(m2 + n)
L	$m\sqrt{s_6}$	$\sqrt{s_{6}n}$	s6(m2 + n)
E	$\sqrt{{\mathit{ns}}_7}$	$m\sqrt{s_7}$	s7(m2 + n)
K	$\sqrt{{\mathit{ns}}_8}$	$m\sqrt{s_8}$	s8(m2 + n)
R	$\sqrt{{\mathit{ns}}_9}$	$m\sqrt{s_9}$	s9(m2 + n)
T	$\sqrt{{\mathit{ns}}_{10}}$	$-m\sqrt{s_{10}}$	s10(m2 + n)
Y	$\sqrt{{\mathit{ns}}_{11}}$	$-m\sqrt{s_{11}}$	s11(m2 + n)
H	$\sqrt{{\mathit{ns}}_{12}}$	$-m\sqrt{s_{12}}$	s12(m2 + n)
C	$\sqrt{{\mathit{ns}}_{13}}$	$-m\sqrt{s_{13}}$	s13(m2 + n)
N	$\sqrt{{\mathit{ns}}_{14}}$	$-m\sqrt{s_{14}}$	s14(m2 + n)
Q	$\sqrt{{\mathit{ns}}_{15}}$	$-m\sqrt{s_{15}}$	s15(m2 + n)
w	$\sqrt{{\mathit{ns}}_{16}}$	$-m\sqrt{s_{16}}$	s16(m2 + n)
–	$m\sqrt{s_{17}}$	$\sqrt{{\mathit{ns}}_{17}}$	s17(m2 + n)