- const blockedCountries = new Set(board.settings.blockedCountries);
select(name='countries' size='10' multiple)
	optgroup(label='Currently blocked')
		each code in board.settings.blockedCountries
			option(value=code selected=true) #{countryNamesMap[code]}
	optgroup(label='Not blocked')
		each code in countryCodes.filter(c => !blockedCountries.has(c))
			option(value=code) #{countryNamesMap[code]}