>Sorry for not replying earlier , I've been away for a few days - It will take me a while to get my head around this "problem reduction" stuff - thanks for your time


Pete,

We do this "problem reduction" stuff all the time

The only difference here is that it has a recursive nature


In programming

func_x()
{
    func_y()
    func_z()
   ...
}
func_x()
{
    func_x1()
    func_x2()
    ...
}
func_x1()
{
    func_x1_1()
    func_x1_2()
   ...
}

In real life
- go to work in the morning
- get up
- prepare
- drive to work

prepare
- wash
- dress

drive to work
- start car
- drive it
- park