Rule reminder

PROBLEM group: 'Problema' = problem (general). 'Questione' = matter/issue (formal; implies something to be discussed or resolved). 'Difficoltà' = difficulty (implies a challenge that requires effort). 'Ostacolo' = obstacle (concrete or abstract barrier to progress). BEGINNING group: 'Inizio' = beginning (general). 'Avvio' = launch/start (formal; implies a deliberate start of a project or process). 'Apertura' = opening (of events, exhibitions, shops). 'Esordio' = debut (first appearance of a person or work in a field).