if(a.length == 0 && b.length == 0){
int[] c = new int[] {};
return c;
}
if(a.length == 0){
int[] c = new int[1];
c[0] = b[0];
return c;
}
if(b.length == 0){
int[] c = new int[1];
c[0] = a[0];
return c;
}
else{
int[] c = new int[2];
c[0] = a[0];
c[1] = b[0];
return c;
}
}
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