INT OK
add 1 OK
add 2 OK
add 3 OK
find 0 not found
find 1 found
find 2 found
find 3 found
STRING OK
find 0 not found
find 1 not found
add lazy OK
add lazy Error
print 
  1: lazy
add dog. OK
add fox OK
add brown OK
add quick OK
add The OK
size 6
print 
  1: lazy
  2: dog. quick
  3: brown fox
  4: The _
find lazy found
find fox found
find dog not found
size 6
print 
  1: lazy
  2: dog. quick
  3: brown fox
  4: The _