PB&J algorithm

Make PB&J sandwich {

   ingredient bread1[inside,outside]

   ingredient bread2[inside,outside]

   ingredient pb

   ingredient jelly

   Knife.get(pb)

   Knife.spread(pb,bread1[inside])

   Knife.get(jelly)

   Knife.spread(jelly,bread2[inside])

   Join(bread1[inside],bread2[inside])

}