eliminate duplicate in a cell

Hi ,im asking if there is a way to eliminate the dublicate,so the result must be('eight two lions') .Any help is greatly appreciated.

>> a

a =

    'الأسود  إثنان' ('two lions')

>> b

b =

    'الأسود ثمانية' ('eight lions')
>> class(a)

ans =

cell

>> class(b)

ans =

cell

>> strcat(b,{' '},a)

ans =

    'الأسود ثمانية الأسود  إثنان' ('eight lions two lions)

[Elias Gule]

c = [a ' ' b]; c = unique(regexp([c{:}],'\s+','split'));

tmp = c(2); c(2) = c(3); c(3) = tmp;

[ben zekri raouf]

it works really good,thank you so much :)