>>Except for "Clean" :-)
>> Could you explain, what's wrong with it? My english is far from good. Should I use "Clear" instead?

It's Resolved!

PS I have not a,b inside the MathArray as shown on the "Line Video" above ?
No Multiple Clone ?

Edit : about the a,b :):): You can add them by Right Click on the Node MathArray then "Inputs" !

Last French Version! :)
http://moiscript.weebly.com/elephant-systegraveme-nodal.html
By Max S