Four girlfriends always roller-skate together.
They join hands and form a circle that rotates more and more quickly. They practice this figure every day.
The four girls each were introduced to roller-skating at a different age and so their experience level varies
(two, three, four or five years).
Just watching them makes you dizzy but you can still can gather the following information:
The girl, who has been roller-skating for three years, is on the left side of Petra.
Erika has two years of experience in roller-skating.
The girl with the short dark hair has green roller-skates.
The girl with the long blond hair has had her roller-skates one year less than the girl with the short blond hair.
The girl with the yellow roller-skates is on the left of the girl who has four years of experience in roller-skating..
The girl with the blue roller-skates stands in the circle opposite from the girl with the short blond hair.
One year of experience separates the girl with the red roller-skates and the girl with the green roller-skates.
One year of experience separates the girl with the long dark hair and the girl with the long blond hair.
One year of experience separates Sabrina and the girl with the long dark hair.
Question: What is the colour of each girl’s roller-skates ?