( tbl$(mytable,100)
& 5:?(30$mytable)
& 9:?(31$mytable)
& out$(!(30$mytable))
& out$(!(-169$mytable)) { -169 mod 100 == 31 }
& out$!mytable { still index 31 }
& tbl$(mytable,0)
& (!mytable & out$"mytable still exists"
| out$"mytable is gone"
)
);