Question: We collaborated and wrote a paper together for the Mathematische Annalen. I always had a good relationship with Thullen.

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Answer: WecollaboratedandwroteapapertogetherfortheMathematischeAnnalen.IalwayshadagoodrelationshipwithThullen.

Question: There are few ways using which it can be accomplished.

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Answer: Therearefewwaysusingwhichitcanbeaccomplished.

Question: Attraction - Free English online dictionary based on WordNet 3.0

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Answer: Attraction-FreeEnglishonlinedictionarybasedonWordNet3.0

Question: We also spent a long time together at Copenhagen University Hospital in Denmark.

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Answer:
WealsospentalongtimetogetheratCopenhagenUniversityHospitalinDenmark.