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- in 1968 Prague
- in 197
- in 1972 he started
- in 1976, he
- in 1976, he
- in 1976, he
- in 1980-191
- in 1980 et seqq
- in 1986, we had
- in 1986, we had
- in 199
- in 1994 Chris
- in 1994 Chris
- in 1996 Germany
- in 1996 Google
- in 1996 Google
- in 1996 in Germany
- in 1997, a transport
- in 1997, a transport
- in 1997, a transport
- in 1997, a transport
- in 1999 during
- in 1999, he became
- in 1999, he became
- in 1999, he became
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