[Guide] Itemsettype.txt explain

// item mumber (sub type) link-a link-b mixitemlevel-a mixitemlevel-b
0
2 21 0 0 0 // rapier

itemsetoption
21 "seto" 1 10 -1 -1 11 50 -1 -1 10 20 -1 -1 22 5 -1 -1 2 10 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 11 50 0 20 -1 -1 -1 -1 -1 -1 0 0 0 0 0

shop code
0 2 0 0 0 0 0 // rapier

##### code explain :

0 : item type
2 : item index (number)
21 : set number

so rapier is belong to seto set ^^