two_letters_combination();
function two_letters_combination()
{
$s = "abcdefghijklmnopqrstuvwxyz0123456789";
$s_size = strlen($s);
for ($i = 0; $i < $s_size; $i++)
{
for ($j = 0; $j < $s_size; $j++)
{
echo $s[$i] . "-" . $s[$j] . " ";
}
echo "<br />";
}
}
/*
run:
a-a a-b a-c a-d a-e a-f a-g a-h a-i a-j a-k a-l a-m a-n a-o a-p a-q a-r a-s a-t a-u a-v a-w a-x a-y a-z a-0 a-1 a-2 a-3 a-4 a-5 a-6 a-7 a-8 a-9
b-a b-b b-c b-d b-e b-f b-g b-h b-i b-j b-k b-l b-m b-n b-o b-p b-q b-r b-s b-t b-u b-v b-w b-x b-y b-z b-0 b-1 b-2 b-3 b-4 b-5 b-6 b-7 b-8 b-9
c-a c-b c-c c-d c-e c-f c-g c-h c-i c-j c-k c-l c-m c-n c-o c-p c-q c-r c-s c-t c-u c-v c-w c-x c-y c-z c-0 c-1 c-2 c-3 c-4 c-5 c-6 c-7 c-8 c-9
d-a d-b d-c d-d d-e d-f d-g d-h d-i d-j d-k d-l d-m d-n d-o d-p d-q d-r d-s d-t d-u d-v d-w d-x d-y d-z d-0 d-1 d-2 d-3 d-4 d-5 d-6 d-7 d-8 d-9
e-a e-b e-c e-d e-e e-f e-g e-h e-i e-j e-k e-l e-m e-n e-o e-p e-q e-r e-s e-t e-u e-v e-w e-x e-y e-z e-0 e-1 e-2 e-3 e-4 e-5 e-6 e-7 e-8 e-9
f-a f-b f-c f-d f-e f-f f-g f-h f-i f-j f-k f-l f-m f-n f-o f-p f-q f-r f-s f-t f-u f-v f-w f-x f-y f-z f-0 f-1 f-2 f-3 f-4 f-5 f-6 f-7 f-8 f-9
g-a g-b g-c g-d g-e g-f g-g g-h g-i g-j g-k g-l g-m g-n g-o g-p g-q g-r g-s g-t g-u g-v g-w g-x g-y g-z g-0 g-1 g-2 g-3 g-4 g-5 g-6 g-7 g-8 g-9
h-a h-b h-c h-d h-e h-f h-g h-h h-i h-j h-k h-l h-m h-n h-o h-p h-q h-r h-s h-t h-u h-v h-w h-x h-y h-z h-0 h-1 h-2 h-3 h-4 h-5 h-6 h-7 h-8 h-9
i-a i-b i-c i-d i-e i-f i-g i-h i-i i-j i-k i-l i-m i-n i-o i-p i-q i-r i-s i-t i-u i-v i-w i-x i-y i-z i-0 i-1 i-2 i-3 i-4 i-5 i-6 i-7 i-8 i-9
j-a j-b j-c j-d j-e j-f j-g j-h j-i j-j j-k j-l j-m j-n j-o j-p j-q j-r j-s j-t j-u j-v j-w j-x j-y j-z j-0 j-1 j-2 j-3 j-4 j-5 j-6 j-7 j-8 j-9
k-a k-b k-c k-d k-e k-f k-g k-h k-i k-j k-k k-l k-m k-n k-o k-p k-q k-r k-s k-t k-u k-v k-w k-x k-y k-z k-0 k-1 k-2 k-3 k-4 k-5 k-6 k-7 k-8 k-9
l-a l-b l-c l-d l-e l-f l-g l-h l-i l-j l-k l-l l-m l-n l-o l-p l-q l-r l-s l-t l-u l-v l-w l-x l-y l-z l-0 l-1 l-2 l-3 l-4 l-5 l-6 l-7 l-8 l-9
m-a m-b m-c m-d m-e m-f m-g m-h m-i m-j m-k m-l m-m m-n m-o m-p m-q m-r m-s m-t m-u m-v m-w m-x m-y m-z m-0 m-1 m-2 m-3 m-4 m-5 m-6 m-7 m-8 m-9
n-a n-b n-c n-d n-e n-f n-g n-h n-i n-j n-k n-l n-m n-n n-o n-p n-q n-r n-s n-t n-u n-v n-w n-x n-y n-z n-0 n-1 n-2 n-3 n-4 n-5 n-6 n-7 n-8 n-9
o-a o-b o-c o-d o-e o-f o-g o-h o-i o-j o-k o-l o-m o-n o-o o-p o-q o-r o-s o-t o-u o-v o-w o-x o-y o-z o-0 o-1 o-2 o-3 o-4 o-5 o-6 o-7 o-8 o-9
p-a p-b p-c p-d p-e p-f p-g p-h p-i p-j p-k p-l p-m p-n p-o p-p p-q p-r p-s p-t p-u p-v p-w p-x p-y p-z p-0 p-1 p-2 p-3 p-4 p-5 p-6 p-7 p-8 p-9
q-a q-b q-c q-d q-e q-f q-g q-h q-i q-j q-k q-l q-m q-n q-o q-p q-q q-r q-s q-t q-u q-v q-w q-x q-y q-z q-0 q-1 q-2 q-3 q-4 q-5 q-6 q-7 q-8 q-9
r-a r-b r-c r-d r-e r-f r-g r-h r-i r-j r-k r-l r-m r-n r-o r-p r-q r-r r-s r-t r-u r-v r-w r-x r-y r-z r-0 r-1 r-2 r-3 r-4 r-5 r-6 r-7 r-8 r-9
s-a s-b s-c s-d s-e s-f s-g s-h s-i s-j s-k s-l s-m s-n s-o s-p s-q s-r s-s s-t s-u s-v s-w s-x s-y s-z s-0 s-1 s-2 s-3 s-4 s-5 s-6 s-7 s-8 s-9
t-a t-b t-c t-d t-e t-f t-g t-h t-i t-j t-k t-l t-m t-n t-o t-p t-q t-r t-s t-t t-u t-v t-w t-x t-y t-z t-0 t-1 t-2 t-3 t-4 t-5 t-6 t-7 t-8 t-9
u-a u-b u-c u-d u-e u-f u-g u-h u-i u-j u-k u-l u-m u-n u-o u-p u-q u-r u-s u-t u-u u-v u-w u-x u-y u-z u-0 u-1 u-2 u-3 u-4 u-5 u-6 u-7 u-8 u-9
v-a v-b v-c v-d v-e v-f v-g v-h v-i v-j v-k v-l v-m v-n v-o v-p v-q v-r v-s v-t v-u v-v v-w v-x v-y v-z v-0 v-1 v-2 v-3 v-4 v-5 v-6 v-7 v-8 v-9
w-a w-b w-c w-d w-e w-f w-g w-h w-i w-j w-k w-l w-m w-n w-o w-p w-q w-r w-s w-t w-u w-v w-w w-x w-y w-z w-0 w-1 w-2 w-3 w-4 w-5 w-6 w-7 w-8 w-9
x-a x-b x-c x-d x-e x-f x-g x-h x-i x-j x-k x-l x-m x-n x-o x-p x-q x-r x-s x-t x-u x-v x-w x-x x-y x-z x-0 x-1 x-2 x-3 x-4 x-5 x-6 x-7 x-8 x-9
y-a y-b y-c y-d y-e y-f y-g y-h y-i y-j y-k y-l y-m y-n y-o y-p y-q y-r y-s y-t y-u y-v y-w y-x y-y y-z y-0 y-1 y-2 y-3 y-4 y-5 y-6 y-7 y-8 y-9
z-a z-b z-c z-d z-e z-f z-g z-h z-i z-j z-k z-l z-m z-n z-o z-p z-q z-r z-s z-t z-u z-v z-w z-x z-y z-z z-0 z-1 z-2 z-3 z-4 z-5 z-6 z-7 z-8 z-9
0-a 0-b 0-c 0-d 0-e 0-f 0-g 0-h 0-i 0-j 0-k 0-l 0-m 0-n 0-o 0-p 0-q 0-r 0-s 0-t 0-u 0-v 0-w 0-x 0-y 0-z 0-0 0-1 0-2 0-3 0-4 0-5 0-6 0-7 0-8 0-9
1-a 1-b 1-c 1-d 1-e 1-f 1-g 1-h 1-i 1-j 1-k 1-l 1-m 1-n 1-o 1-p 1-q 1-r 1-s 1-t 1-u 1-v 1-w 1-x 1-y 1-z 1-0 1-1 1-2 1-3 1-4 1-5 1-6 1-7 1-8 1-9
2-a 2-b 2-c 2-d 2-e 2-f 2-g 2-h 2-i 2-j 2-k 2-l 2-m 2-n 2-o 2-p 2-q 2-r 2-s 2-t 2-u 2-v 2-w 2-x 2-y 2-z 2-0 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9
3-a 3-b 3-c 3-d 3-e 3-f 3-g 3-h 3-i 3-j 3-k 3-l 3-m 3-n 3-o 3-p 3-q 3-r 3-s 3-t 3-u 3-v 3-w 3-x 3-y 3-z 3-0 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9
4-a 4-b 4-c 4-d 4-e 4-f 4-g 4-h 4-i 4-j 4-k 4-l 4-m 4-n 4-o 4-p 4-q 4-r 4-s 4-t 4-u 4-v 4-w 4-x 4-y 4-z 4-0 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9
5-a 5-b 5-c 5-d 5-e 5-f 5-g 5-h 5-i 5-j 5-k 5-l 5-m 5-n 5-o 5-p 5-q 5-r 5-s 5-t 5-u 5-v 5-w 5-x 5-y 5-z 5-0 5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 5-9
6-a 6-b 6-c 6-d 6-e 6-f 6-g 6-h 6-i 6-j 6-k 6-l 6-m 6-n 6-o 6-p 6-q 6-r 6-s 6-t 6-u 6-v 6-w 6-x 6-y 6-z 6-0 6-1 6-2 6-3 6-4 6-5 6-6 6-7 6-8 6-9
7-a 7-b 7-c 7-d 7-e 7-f 7-g 7-h 7-i 7-j 7-k 7-l 7-m 7-n 7-o 7-p 7-q 7-r 7-s 7-t 7-u 7-v 7-w 7-x 7-y 7-z 7-0 7-1 7-2 7-3 7-4 7-5 7-6 7-7 7-8 7-9
8-a 8-b 8-c 8-d 8-e 8-f 8-g 8-h 8-i 8-j 8-k 8-l 8-m 8-n 8-o 8-p 8-q 8-r 8-s 8-t 8-u 8-v 8-w 8-x 8-y 8-z 8-0 8-1 8-2 8-3 8-4 8-5 8-6 8-7 8-8 8-9
9-a 9-b 9-c 9-d 9-e 9-f 9-g 9-h 9-i 9-j 9-k 9-l 9-m 9-n 9-o 9-p 9-q 9-r 9-s 9-t 9-u 9-v 9-w 9-x 9-y 9-z 9-0 9-1 9-2 9-3 9-4 9-5 9-6 9-7 9-8 9-9
*/
