Show syntax:

 show { <keywords> or <number> }

Buy syntax:

 buy { <1..20> or <one...twenty> } of { <keywords> or <number> }

Sell syntax:

 sell [<number>.|all.]<keyword>

List syntax:

 list { <keywords> or <number> }
 list worn {head|body|on body|about body|...}
 list weapons that {slash|pierce|crush|cleave|...}
 list wielded {with one hand|with two hands|dual}

Examples:

 show 43
 buy a dozen war arrows
 sell all.metal
 list worn on legs