Φ
max
→ e
c
= 0 → i = 0
a
b
c
d
N
M
N S
d
c
b
a
N-
Φ ≠ 0 → e
c
≠ 0 (dcba) → i ≠ 0 (MN)
M+
Φ = 0 → e
c
max
(dcba) → i
max
(MN)
a
bc
d
N-
M+
d
c
b
a
N-
Φ ≠ 0 → e
c
≠ 0 (dcba) → i ≠ 0 (MN)
M+
Φ
max
→ e
c
= 0 → i = 0
a
b
c
d
N
M
a
b
c
d
M-
Φ ≠ 0 → e
c
≠ 0 (abcd) → i ≠ 0 (NM)
N+
a
b c
d
Φ = 0 → e
c
max
(abcd)→ i
max
(NM)
M-
N+
a
b
c
d
M-
Φ ≠ 0 → e
c
≠ 0 (abcd) → i ≠ 0 (NM)
N+
Φ
max
→ e
c
= 0 → i = 0
a
b
c
d
N
M
Φ
max
→ e
c
= 0 → i = 0
a
b
c
d
N
M
d
c
b
a
N-
Φ ≠ 0 → e
c
≠ 0 (dcba) → i ≠ 0 (MN)
M+
Φ = 0 → e
c
max
(dcba) → i
max
(MN)
a
bc
d
N-
M+
d
c
b
a
N-
M+
Φ ≠ 0 → e
c
≠ 0 (dcba) → i ≠ 0 (MN)
Φ
max
→ e
c
= 0 → i = 0
a
b
c
d
N
M
a
b
c
d
M-
Φ ≠ 0 → e
c
≠ 0 (abcd) → i ≠ 0 (NM)
N+
a
b c
d
Φ = 0 → e
c
max
(abcd)→ i
max
(NM)
M-
N+
a
b
c
d
N+
M-
Φ ≠ 0 → e
c
≠ 0 (abcd) → i ≠ 0 (NM)
Φ
max
→ e
c
= 0 → i = 0
a
b
c
d
N
M
S
N
A
B
X
Y
S
N
A
B
X
Y
S
N
A
B
X
Y
S
N
A
B
X
Y
S
N
A
B
X
Y