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    Following are the main parts of the Block Editor window:

                       Built-in  Blocks:  It  contains  all the  predefined  blocks  in  the  application.  They  are
                       responsible for handling operations like Math, Text, Logic and Control.

                       Component Blocks: It contains relevant blocks for the components we have added in

                       the Design window.
                       Workspace: It arranges all the blocks for coding in the workspace.

                       Trash: It is used for deleting blocks that are not required.

                       Backpack: It stores the copy of all the blocks even when we exit App Inventor.

                     Making click event for button

                     To make click event for button, follow the given steps:

                          1  Click on button Talking_Me.

                                                               2  Drag and drop when Talking_Me.Click do
                                                              to workspace.

                     This is an Event Handler block that will handle what happens when the button on your app
                     is clicked.

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