if the single flashing light has a colour of green and the mark is in region "B".
* Starboard hand lateral marks, if the single flashing light has a colour of red and the mark is in region "B".
* Special marks, if the single flashing light has a colour of yellow.

IALA recommendation R0110 specifies that a single flashing light should:

* Have a period of repetition within the range of seconds for countries which do not use "quick lights". This corresponds to frequency of 4 to 30 flashes per minute.
* Have a period

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