1. Among the nutrients plants require for proper growth are nitrogen, phosphorus, and potassium. A deficiency in one of these will produce various symptoms in a plant. For the following heuristics, describe deftemplates appropriate to the facts they suggest, and translate the heuristics into a program of CLIPS rules which determines nutrient deficiency from symptoms. Assume that the plant is normally green.
   • A plant with stunted growth may have a nitrogen deficiency.
   • A plant that is pale yellow in color may have a nitrogen deficiency.
   • A plant that has reddish-brown leaf edges may have a nitrogen deficiency.
   • A plant with stunted root growth may have a phosphorus deficiency.
   • A plant with a spindly stalk may have a phosphorus deficiency.
   • A plant that is purplish in color may have a phosphorus deficiency.
   • A plant that has delayed in maturing may have a phosphorus deficiency.
   • A plant with leaf edges that appear scorched may have a potassium deficiency.
   • A plant with weakened stems may have a potassium deficiency.
   • A plant with shriveled seeds or fruits may have a potassium deficiency.

   Include appropriate comments in each rule. Make inputs to the program by asserting symptoms as facts. The program's output should be which nutrient(s) may be deficient, printed to the terminal. If several symptoms indicate the same nutrient deficiency, a message about that nutrient should be printed only once.

   Test your program with several sets of inputs, including this set of facts:

   • The plant has stunted root growth.
   • The plant is purplish in color.
   • The plant has reddish-brown leaf edges.