Fixed it in this version:
$${PROMPT(&type,$$[type],type of pebbles : e.g. 'easternislands' 'vale' 'dorne' 'arbor' : 'sand' also works)}$$
$${PROMPT(#cutoff,$$[cutoff],cutoff of wet pebbles in mix : number from 0-8 : 0 = all dry : 9 = all wet)}$$
$${PROMPT(#profile,$$[profile],height profile of...