What's the syntax for svirfs to use stone skin? I can't seem to get it to work.

<581hp 200m 375mv 5132tnl> inh 'stone skin'
You don't know any abilities of that name.

<581hp 200m 375mv 5132tnl> inh stoneskin
You don't know any abilities of that name.

<581hp 143m 305mv 5132tnl> inh stone self
You don't know any abilities of that name.

<581hp 176m 340mv 5132tnl> inh 'stone skin' self
You don't know any abilities of that name.

<581hp 176m 340mv 5132tnl> inh 'stone skin'
You don't know any abilities of that name.

<581hp 200m 375mv 5132tnl> inh

Level 1: stone skin 0%

Am I supposed to practice this somehow first?