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Part of the concrete syntax given in the 1960 Report on ALGOL 60 is as follows: I -> if then if then else I begin end In the 1963 report on Algol, this was changed to: I ; then if then else -> statement> I begin end statement> -> Show using examples what if-statements in Algol looked like (with one or more statements in the then/else-parts).
Demonstrate with an example why the original syntax was unsuitable and why the revised syntax is an improvement.

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