overlapping programmes on channel 1:
    A	at 20011228113100-|20011228113101
and C	at 20011228113100-|20011228113101
overlapping programmes on channel 2:
    G	at 20011228113101-|20011229000000
and H	at 20011228113101-|20011229000000
overlapping programmes on channel 5:
    J	at 20011228113101-|20011229000000
and K	at 20011228113101-|20011229000000
overlapping programmes on channel a:
    One hour long	at 20000101000000-|20000101010000
and Zero length in the middle	at 20000101003000-|20000101003000