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| Trigger type | Category | Examples from the stories |
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| Contextual | Public place (10 stories) | Streets, airports, clinics, train stations, hostels, bus stops, saunas, cafés, and ski slopes |
| Professional event (7 stories) | Conferences, exhibitions, and seminars |
| ICT-mediated environment (7 stories) | Phone and video calls, emails, and social network services (e.g., Facebook) |
| Work premises (6 stories) | Kitchens, meeting rooms, offices, and halls |
| Education premises (5 stories) | Campus areas and group classes |
| Social event (2 stories) | Volunteering events and fairs |
|
| Interaction | Direct communication (29 stories) | Introducing each other, small talk, useful information exchange, official meetings, and discussions of fields of interest, problems, and opportunities |
| Repeated encounters (9 stories) | Bumping into the same person several times, attracting attention and motivating follow-up |
| Unsought interactions (9 stories) | Introduction of two actors by a familiar person (e.g., a friend or supervisor) when they least expect it, initiation of interactions by stranger |
| Receiving assistance or advice (8 stories) | Assumption of the role of mentor by the recently encountered person, leading to professional follow-up or valuable outcomes |
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