----------------------------------------
|context> => |context: recall>

supported-ops |person: George> => |op: bro> + |op: sis>
bro |person: George> => |person: Fred> + |person: Harry>
sis |person: George> => |person: Mary>

supported-ops |*> => |op: my-id>
my-id |*> #=> |_self>

supported-ops |person: *> => |op: sibs> + |op: is-human> + |op: bro> + |op: sis>
sibs |person: *> #=> bro |_self> + sis |_self>
is-human |person: *> #=> |yes!>
bro |person: *> #=> brothers |_self>
sis |person: *> #=> sisters |_self>

supported-ops |person: Zack> => |op: brothers> + |op: sisters>
brothers |person: Zack> => |bro 3> + |bro 4> + |bro 5>
sisters |person: Zack> => |sis 1>
----------------------------------------