\input ARPA.TEX (ARPA.TEX 1 2 (macros.TEX[can,rpg 1 (basic.TEX[tex,sys] 1 2 3 4) (pai.TEX[can,rpg] 1) (mac.TEX[can,rpg] 1 2 3 4 5 6 7 8 [1])) 3 4 [1] [2] 5 [3] 6 7 [4] 8 9 [5]