SKIP and NOSKIP

If a number of lines need to be commented-out (i.e. skipped), the keywords SKIP/NOSKIP can be used: SKIP starts the block of lines to be skipped, and nothing will be read until a NOSKIP keyword is found.

TIME
  FINAL_TIME 1000 d
  ! Initial step
  INITIAL_TIMESTEP_SIZE 0.01 d
  SKIP ! Remove the following two lines
  MAXIMUM_TIMESTEP_SIZE 10 d at 20. d
  MAXIMUM_TIMESTEP_SIZE 50 d at 200 d
  NOSKIP
END