The wood is extremely hard, being one of the hardest woods in Northern America. The wood is among the hardest and heaviest known. It is also the hardest and most technical. Louis fought one of the hardest battles of his life. This is supposed to be one of the hardest events. This is the most immediately damaging, and the hardest to control. Morse is considered one of the hardest working guitarists in the world. Deep Purple are considered to be one of the hardest touring bands in the world. Enamel is the hardest and most highly mineralized substance of the body. A product needs to be able to work even in the hardest of scenarios. Creating the characters proved to be one of the hardest parts of development. Foreman was considered one of the hardest punchers in heavyweight history. The system consists of five classes indicating the technical difficulty of the hardest section. Hernandez was, however, known as one of the hardest working members of the team. Rebuilding began quickly on the hardest hit islands.