Each half-segment is denoted by the segment letter followed by 1 for the 1st half, and 2 for the second half, so A1 is the first half of segment A, and A2 is the second half, and similar for the other 14 segments B through O. We are walking a half-segment on Saturday and Sunday, then repeating every two weeks for each successive segment. We plan to walk the toughest 4 half-segments on successive Saturdays in May and early June.