In all  examples I can see in my book about 'case ..' 'when..' 'then.. '
there is only one statement after the 'when..'  I understand using 
'then' if the statement is on the same line as 'when', BUT
can I write multiple statements after the 'when' ?

like that :

case 'a'
	when 'a1'
		puts..
		puts ...
	return
	when 'a2'
		puts ...
		puts ...
		puts ...
	return
	when 'a3'  then puts ...
	else
		puts ...
		puts  ...
end

thansk fyh