s.hoskin@xtra.co.nz said:

Thanks for piecing together the logic which can at times be difficult to decipher.

Kind wishes,

 Su. 

  _____     ___                    ___                _      
| __ \ / _ \ / _ \ | |
| |__) | | (_) | _ _ _ __ | (_) | _ __ ___ | |
| ___/ > _ < | | | | | '__| \__, | | '_ ` _ \ | |
| | | (_) | | |_| | | | / / | | | | | | | |____
|_| \___/ \__,_| |_| /_/ |_| |_| |_| |______|