Competitor: Three variables

Three variables, Government Pressure; Competitor Pressure; Management Support; and Perceived benefits were found to be non-significant and thus removed from subsequent analysis. Maybe even all 4 are wrong (minor changes) but I would like to know which combination of commas, semi-colons, and dashes are the best for using in the above sentence ... Thouugh they are "rivals" or "opponents" or "competitors" in sports field and play the table tennis for different clubs, they are very good friends out of sports field. Are they all correct? If so, which one is most common in AmE? Thank you. Hi everybody, i'm a french student currently carrying out a research project in New Zealand. I found the expression : "you're a bit of a black horse" in a greetings card which is very funny and i'd like to know what it means exactly before send it to a friend. thanks a lot. Hola a todos: no encuentro traducción al español para el término pure-play dot-com. Vean el contexto:A customer, competitor or supplier goes out of business or merges with another company. With de demise of many pure-play dot-coms, examples of this abound. Gracias de antemano por su ayuda.