Lines with a 🔴 red background marked with a minus sign ➖ are removed at that step.Lines with a 🟢 green background marked with a plus sign ➕ are added at that step.Sometimes lines are newly added or totally removed, but quite often an added line is a modified version of the removed line. For example, in the screengrab above, line 2 and line 8 are new but all other added lines are a modified replacement for the removed line above it.
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