All together, these 3 documents are very rich of solving techniques.
IMHO, if interested => download the 3 ... not to miss some essentials.

Jean

Solve TREASURY_1.sm (25,42 KiB) scaricato 1408 volta(e).

Solve TREASURY_2.sm (53,23 KiB) scaricato 1326 volta(e).

Solve TREASURY_0.sm (116,61 KiB) scaricato 1401 volta(e).