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Logisim Projects
1

‏‏צילום מסך (67)
‏‏צילום מסך (67)1920×1080 162 KB

why the color of the circle is blue? it doesn’t give any output.

2

This is a known Logisim bug.
Unfortunately the only thing you can do is restart Logisim and hope for the best. I wish I had a better fix.