abcd cu bara deasupra
a + b= c +d = 5
variante:
a =1 a = 3
b =4 b = 2
c =2 c = 4
d =3 d = 1
1423 3214
a =2 a = 1
b =3 b = 4
c =1 c = 0
d= 4 d = 5
2314 1405
a =5 a = 1
b =0 b = 4
c = 4 c = 5
d = 1 d = 0
5041 1450
a = 4 a = 5
b = 1 b =0
c = 3 c = 3
d = 2 d = 2
4132 5032
a ∈{1,2,3,4,5}
b ∈{0,1,2,3,4}
c ∈{0,1,2,3,4,5}
d ∈{0,1,2,3,4,5]
