matrix{
rcol{ {hphantom {roman "fail"} H} above {hphantom {roman "fail"} T} above {hphantom {roman "fail"} U} }
rcol{ A above I above Y }
} = matrix{
lcol{ A above I above Y }
lcol{ {H hphantom {roman "fail"}} above {T hphantom {roman "fail"}} above {U hphantom {roman "fail"}} }
}