p
+
12
C
→
13
N
+
…
p
+
13
N
→
14
O
+
…
→
14
N
+
e
+
+
ν
e
+
…
p
+
14
N
→
15
O
+
…
→
15
N
+
e
+
+
ν
e
+
…
p
+
15
N
→
12
C
+
4
H
e
+
…
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