Make a night signal / GOTO

A blinking signal for the night,it turns on and off every 0.5 seconds.
Type line 10 and press ENTER key, then take back the cursor to line 10 and change the head "10" to "20", and press ENTER key.
Confirm if the line 10 copied to line 20 with "LIST"!
Blink all the time with "GOTO". About 30,000 times until morning.
The number after "GOTO" is a jumping destination.
> line 10, blink one time
> line 20, jump to line 10
To stop, press [ESC] key.
Fast blink
Display a program with "LIST" (=F4 key). Change two "30" to "3" in line 10 , press ENTER key, and execute by "RUN" (=F5 key).
Repeat alternately between short blink and long blink.
Make a line 15 between line 10 and line 20 by changing the line 10's head to 15 and wait 3 to 30, and press ENTER key.
Try it!
1. Let's return to a night signal program
2. Lengthen only lighting time
3. Try to fix it to a game that blink at high speed and stop when it is lighting
4. Make the line numbers from 100 per 100 steps, e.g. 100,200,300
5. Let's make a cool blink pattern, and boast to somebody.
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