console.log(a);
console.log(a.swap( 1,  8));
console.log(a.swap( 2,  8));
console.log(a.swap( 3,  9));
console.log(a.swap( 4,  8));
console.log(a.swap( 5, 10));
console.log(a.swap( 6,  9));
console.log(a.swap( 7, 11));
console.log(a.swap( 8,  8));
console.log(a.swap( 9, 12));
console.log(a.swap(10, 10));
console.log(a.swap(11, 13));
console.log(a.swap(12, 12));
console.log(a.swap(13, 14));