Individual akts#time-measure-day__day
  akts#has-unit-of-measure of:  akts#seven-day-duration [55,*]
  akts#has-unit-of-measure of:  akts#twentyeight-day-duration [50,*]
  akts#has-unit-of-measure of:  akts#twentynine-day-duration [50,*]
  akts#has-unit-of-measure of:  akts#thirty-day-duration [51,*]
  akts#has-unit-of-measure of:  akts#thirtyone-day-duration [51,*]
  type:  pm#unit_of_time_duration  the class of all unit of measures used to measure time, e.g., minute, second, hour, etc.

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