Looking for some PLC GRAFCET exercices to practice on !!

I have an exam coming soon and i will be given some GRAFCET problems 

I will be asked to give the grafcet of a given automated process and make from it the program in ladder logic language that will be installed on the PLC .

I don't find a very structured exercices for this type of course , i hope some one can give a link , am sure i will get better if some one takes the time to share his help .

Thanks in advance


This is an example :



Here is a ladder logic example :




And here is a grafcet example :