Bouldering also has a number of grading systems: Hueco[?] V grades, Fontainebleau technical grades and route colours and overall difficulty grades, Peak District B grades, British technical grades.
... age of 18 living with them, 70.9% are married couples living together, 7.3% have a female householder with no husband present, and 17.9% are non-families. 13.4% of all ...