Having developed the playground swing set it was noted that the enclosure was sufficiently airtight that a child would only have 2 minutes of oxygen before he/she would pass out and the next child could get a turn. In hindsight the consdiration of the parents and owner of the grounds should have been taken into account as pit underneath the swing was, based on a survey, found to be unethical in the way it removed the child in peparation for the next rider. Also the suffocation was not well received. On the bright side though, all requirements were met.

Hosted while bouncing ideas on a seesaw by M. Boer and S. Schekman on 30 July 2020

Keys: URS, PRS, constraint based problems, breaking down the problem using the URS