*\input basic (basic.TEX 1 2 3 4) *\vsize 30xpgin ! Illegal unit of measure (pt inserted). <to be read again> x <to be read again> x p (*) \vsize 30xp gin ↑4 (*) \vsize 30xpgi n ↑1 (*) \vsize 30xpgin ↑ *\vsize 30xgpin *\eject a\par\vfill\end [1] [2]