is.integer(id) # id
id > 0 & id < 11 # id
is.character(lastname) #lastname
is_proper_name(lastname) #lastname
is.character(firstname) #firstname
is_proper_name(firstname) #firstname
is.character(gender) #gender
is_one_of(gender, c("m", "f")) #gender
age > 10 & age < 70
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