floor level deck tier story mezzanine flight entresol layer landing bank row line rank file order series stage plane stratum echelon section upstairs flat surface division string column train range chain queue procession sequence succession crocodile cue progression group list concatenation array convoy stream caravan lineup cavalcade consecution arrangement formation hierarchy backup fleet tail parade armada length troop lane catalog axis block connection catalogue run course cycle set spate wave rash round streak battery suite outbreak cordon alternation suit chapter continuity scale gradation strip