“on start”: command block only runs once to start
program.
LED dot matrix displays 1,2,3,4,5
Under the block “forever”，program runs cyclically.
Dot matrix shows the“↓” pattern
Dot matrix scrolls to show “Hello!”
“❤”is shown on dot matrix
LED dot matrix displays“North East”arrow.
The“South East”arrow shows up on LED dot
matrix
The“South West”arrow appears up on LED
dot matrix
The“North West”arrow is displayed on LED
dot matrix
Clear the screen
Delay in 500ms
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