First of, look at the patterns. Tell me what you can figure.

Its interesting how the patterns unfolds. Just look at the result :

a
b c b
c d e d c
d e f g f e d
e f g h i h g f e
f g h i j k j i h g f
g h i j k l m l k j i h g
h i j k l m n o n m l k j i h
i j k l m n o p q p o n m l k j i
j k l m n o p q r s r q p o n m l k j
k l m n o p q r s t u t s r q p o n m l k
l m n o p q r s t u v w v u t s r q p o n m l
m n o p q r s t u v w x y x w v u t s r q p o n m
n o p q r s t u v w x y z z y x w v u t s r q p o n
o p q r s t u v w x y z z y x w v u t s r q p o
p q r s t u v w x y z z y x w v u t s r q p
q r s t u v w x y z z y x w v u t s r q
r s t u v w x y z z y x w v u t s r
s t u v w x y z z y x w v u t s
t u v w x y z z y x w v u t
u v w x y z z y x w v u
v w x y z z y x w v
w x y z z y x w
x y z z y x
y z z y

I'm currently developing a webpage that when user input the data needed in Advance Filtering and click on the button'Search Result',the table will show the data needed,but the problem is ...