1
2
3
4
5
hola
978
X
N
=
R
978
X
1
=
978
978
X
2
=
1956
978
X
3
=
2934
978
X
4
=
3912
978
X
5
=
4890
978
X
6
=
5868
978
X
7
=
6846
978
X
8
=
7824
978
X
9
=
8802
978
X
10
=
9780
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