we turn coffee into puzzles

Carriage House Sudoku Fill in the grid so that each row, column, and jigsaw region contains exactly the letters in "CARRIAGE HOUSE". Note that the letters 'A', 'R' and 'E' will each appear twice in each row, column, and region. Appeared at the Carriage House Opening Ceremonies for the new Mathematical Association of America conference facility in Washington, D.C., and on the national MAA website, April 2007. Watch out; this one is hard!