Electric Box Stuck On Level 19 How To Solve Level 31 Of The Game 'Electric Box For Ipod/Iphone' ?

How to solve level 31 of the game 'Electric Box for Ipod/Iphone' ? - electric box stuck on level 19

Anyone who has played this game? It is a little different than the PC version than the PC version has only 15 levels (I think), whereas for the iPod / iPhone version 50 levels.

I'm stuck at level 31, and can not find answers (on the Internet most of the pieces are) for the PC version.

Help someone .....