# task 1: get only names of countries that contains with "ER" or "er"
# note that the search in case-insensitive
countryHas("er", full.list = FALSE)
# task 2: get only names of countries that contains with "LAND" or "lAND" or "land"
countryHas("lAND", full.list = FALSE)
# task 3: repeat task 2, but return full list for each country
countryHas("many", full.list = TRUE)
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