need help with custom volta text

[Kieren MacMillan]

Hi all,

I'm having difficulty applying the example
<http://lilypond.org/doc/v2.13/input/lsr/lilypond-snippets/Repeats#Volta-text-markup-using-repeatCommands>

In my score, I need the first bracket to say "safety" and the second to say "last time only", with no volta numbers in either case. Despite trying for a half-hour, I can't seem to get the right combination of lists, markup, \set, (volta #f), etc.  =(

Any help would be greatly appreciated.

Thanks,
Kieren.