Page 509

[HoshyarKarimi]

In Stop() method:

WriteLine("{0} time span ellapsed.", timer.Elapsed);
WriteLine("{0:N0} total milliseconds ellapsed.", timer.ElapsedMilliseconds);

I thing it should be elapsed not ellapsed. Btw I am not a native English speaker so if I am wrong just skip and close this issue ;)

[markjprice]

Thanks, its fixed now, in both sixth and seventh edition code solutions, and I've added an errata:
https://github.com/markjprice/cs10dotnet6/blob/main/errata.md#page-509---implementing-a-recorder-class