Respuesta :
to go from 1 to 7 add 6
to go from 7 to 13 add 6
to go from 13 to 19 add 6
so the rule is add 6 to go to the next entry
to go from 7 to 13 add 6
to go from 13 to 19 add 6
so the rule is add 6 to go to the next entry