In fact , three of the four widely used mainland dialects are so much alike that a non-Frisian could probably not make out any differences .
Because of their insular nature these four less - used dialects are also those that have deviated the most from mainstream West Frisian .
Three of the four widely used mainland dialects are so much alike that a non-Frisian could probably not make out any differences .
Because of their insular nature these four less - used dialects are also those that have deviated the most from mainstream West Frisian .