There is something to be said for the three languages (“levels”) to actually look sufficiently different from each other, so that when looking at some code it’s immediately clear which one it’s in. Making them too similar increases the likelihood of mistaking which one you’re in, and applying the mindset of one to the other.
Another reason to do that is that the different levels are amenable to different affordances, and have different trade-offs in their design. For example, at level 4 you may want to go for a more BASIC-like syntax, without semicolons, and commands without argument-list parentheses.
Another reason to do that is that the different levels are amenable to different affordances, and have different trade-offs in their design. For example, at level 4 you may want to go for a more BASIC-like syntax, without semicolons, and commands without argument-list parentheses.