: number of condition change from to at the time
Time 1 2 3 4 5 6
1 * 4 1 * 1
1 2 * * 1 *
1 4 * 1 * *
* * * * * *
: number of condition change from 
to 
at the time 
1 * 4 1 * 1 
1 2 * * 1 * 
1 4 * 1 * * 
* * * * * *