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I was working on the cs50 IDE and noticed this happen a couple of time -
As you can see in the last terminal in the last entry the substitution changed to subst i don't know why. This happens mainly when I use the arrow keys to go back in the command history and also I wished to go back to an earlier command however there was no command like the one there in the last command line argument. I don't know what's going wrong
It happens some times. It is still in the substitution directory. If you are not sure then type cd in the terminal and then type cd pset2/substitution in the terminal.
If this helps please check the tickmark.
