Orthocom, the little puzzle book (CLASSIC)

The Sudoku-inspired books comes Orthocom, the little puzzle book (CLASSIC). This type of Orthocom Classification aims to present a variety of Orthocom puzzles and to fill in a 10x10 grid so that letters A, B, C, D, and E and numerals 1,2,3,4, and 5 are paired in each Orthocom phase. These numbers and letters occur exactly once in each row and colu