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