define(`nullor',`nport(`$1'
{`"0"' at Box.w ljust
`"oo"' at Box.e rjust},shift($@))')
N: nullor
`"nullor"' at last [].s+(0,-3pt__) below
G: gyrator with .sw at N.se+(0.5,0)
`"gyrator"' at G.s+(0,-3pt__) below
I: gyrator(invis,,0,N) with .w at G.e+(0.5,0)
`"gyrator(invis,,0,N)"' at I.s
V: gyrator(invis wid boxht,,0,NV) with .w at I.e+(1,0)
`"gyrator(invis wid boxht,,0,NV)"' wid 2 at V.s+(0,-3pt__) below
