The difference in length and articulatory position means that this contrast is unlikely to be a problem for any learners.
Interesting pairs include:
The density value is 4.5%. The 164 semantic distinctions give a semantic loading of 54%.
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Geographical: most visitors apart from Englis-speaking countries come from Hong Kong, Poland, Vietnam, Saudi Arabia, India, Turkey, Philippines, Ecuador, Singapore, Spain, Jordan, Italy, Germany, Tanzania, Hungary. Average of 35 visitors a month.
John Higgins, Shaftesbury, January 2011.