Accepting these commands:
  NEW
  SET
  BRIGHTEN
  DARKEN
  SETarea
  BRIGHTENarea
  DARKENarea
  DISPLAY
  QUIT
ERROR: bad new row size: "grid"
ERROR: missing new column size
ERROR: bad new column size: "cat"
ERROR: new row size out of range: "1"
ERROR: new column size out of range: "1"
ERROR: new row size out of range: "401"
ERROR: new column size out of range: "401"
ERROR: bad red value: "RED"
ERROR: bad green value: "green"
ERROR: bad blue value: "25.5"
ERROR: bad row to set: "red"
ERROR: bad column to set: "red"
ERROR: row to set out of range: "-1"
ERROR: row to set out of range: "3"
ERROR: column to set out of range: "-1"
ERROR: column to set out of range: "5"
ERROR: missing red value
ERROR: missing row to brighten
ERROR: missing column to brighten
ERROR: bad row to brighten: "cat"
ERROR: bad column to brighten: "1.5"
ERROR: row to brighten out of range: "3"
ERROR: column to brighten out of range: "5"
ERROR: missing column to darken
ERROR: bad row to darken: "cat"
ERROR: bad column to darken: "2.5"
ERROR: row to darken out of range: "-1"
ERROR: column to darken out of range: "-1"
ERROR: bad first row to set: "cat"
ERROR: first column to set out of range: "5"
ERROR: second row to set out of range: "1"
ERROR: second column to set out of range: "3"
ERROR: second row to set out of range: "3"
ERROR: missing red value
ERROR: missing second column to brighten
ERROR: second column to brighten out of range: "6"
ERROR: second row to brighten out of range: "1"
ERROR: missing first row to darken
ERROR: missing first column to darken
ERROR: missing second row to darken
ERROR: missing second column to darken
ERROR: second column to darken out of range: "5"
ERROR: second column to darken out of range: "0"