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  1. or download this
    foreach $sub ( @sub_names ) {
    sub $sub {
        #subroutine implementation
    }
}
  2. or download this
    read('light',10); # Retrieve the value of "light" at line 10
read_at_time('light', $timestamp);
  3. or download this
    light(10); # Retrieve the value of "light" at line 10
light_at_time($timestamp);