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Step 9:   From the 'Math', choose 'addition block', it will appear on workspace. Drag and
                            drop the 'addition' block to '0' in 'set c to 0' block.
























                  Step 10:  From the 'Variable', select variable 'a' and 'b', and drag them to workspace, and
                            then drop them to 'set c to '0 + 0' block.



























                                                                                 Variables Using  Block Coding   37
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