Wow!
julia> a=readdlm("data.txt", '\t', ASCIIString)
5x2 Array{ASCIIString,2}:
"Lucy" "cat"
"Fliper" "dog"
"Mia" "dog"
"Nan" "cat"
"Snupy" "dog"
julia> unique(a[:,1])
5-element Array{ASCIIString,1}:
"Lucy"
"Fliper"
"Mia"
"Nan"
"Snupy"
julia> findin(a,"Nan")
0-element Array{Int32,1}
julia> findin(a[:,1],["Nan"])
1-element Array{Int32,1}:
4
julia>
