#empty string
user1@example.com
#just score
user2@example.com 10
#just symbol
user3@example.com SYM1
#unknown symbol
user4@example.com SYM2
#symbol + score
user5@example.com SYM1:-10.1
#symbol + score + options
user6@example.com SYM1:-10.1:opt1,opt2
