Switch aa a 'a' ZERO;
Switch bb b 'b' ZERO;
Switch cc c 'c' ZERO;
Switch dd d 'd' ZERO;
Switch ee e 'e' ZERO;
Switch ac-ae f 'f' ZERO;
Switch bd-be g 'g' ZERO;
Switch ca-db h 'h' ZERO;
Switch ea.aa i 'i' ZERO;
Switch ea.aa j 'j' ZERO;
Switch ea.aa k 'k' ZERO;
Switch ea.aa l 'l' ZERO;
Switch eb.aa m 'm' ZERO;
Switch eb.ee n 'n' ZERO;
Switch ec.aa o 'o' ZERO;
Switch ec.bb p 'p' ZERO;
Switch ec.ee q 'q' ZERO;

Screen cell positions(coord) are composed using the syntax:
    coord = {C}{C}
    | {C}{C}-{C}{C}
    | cell.cell
where {C} is defined to be any single ASCII character, but, for simplicity, usually restricted to be one of:
    {C} = [a-zA-Z0-9]

Grid Map

Click the grid cell to see the highlighted statement