when-phrase Format
1 WHEN
2.1 ZERO
2.1 ZEROES
2.1 ZEROS
2.1 SPACE
2.1 SPACES
2.1 LOW-VALUE
2.1 LOW-VALUES
2.1 HIGH-VALUE
2.1 HIGH-VALUES
1? + ? OR
2.1 ZERO
2.1 ZEROES
2.1 ZEROS
2.1 SPACE
2.1 SPACES
2.1 LOW-VALUE
2.1 LOW-VALUES
2.1 HIGH-VALUE
2.1 HIGH-VALUES