In the description I have placed a number in parentheses, this is the difficulty level.

(1) being the easiest.

(2) being more difficult and 

(3) being the hardest 

1248S-1
1248S-3
1248S-2
1248S-4
1248S-6
1248S-5
1248SP-1
1248SP-3
1248SP-2
1224P-1
1224E-1
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