Hi,
I have a different join block
http://www.appinventor.org/bookChapters/chapter4.pdf
Page 70 Figure 4-8.
My join block is different. Howto proceed ?
You don’t, you just have to add more connectors by clicking on the small blue square
See how the mutator blocks work here:
Tank you very very much. You saved my hair !
You are lucky you still have some 
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