Highest simultaneous occurence at a time

[Arjen Bakker]

Dear all,

I would need a formula which gives the highest simultaneous
occurence. In this simplyfied example it would 2 for "A" and
1 for "B"
Seems easy but I don't grasp it.

Thanks very much ... Arjen

A	14:00	15:30
A	15:30	17:30
A	14:30	18:30

<colgroup><col width="64" style="width: 48pt;"> <col width="72" style="width: 54pt; mso-width-source: userset; mso-width-alt: 2633;"> <col width="64" style="width: 48pt;"> <tbody> </tbody>

B	14:00	15:30
B	18:30	20:30

<colgroup><col width="64" style="width: 48pt;"> <col width="72" style="width: 54pt; mso-width-source: userset; mso-width-alt: 2633;"> <col width="64" style="width: 48pt;"> <tbody> </tbody>