Shelf

s1

s2

s3

s4

Coordinate

(3, 7)

(5, 7)

(7, 7)

(9, 7)

Shelf

s5

s6

s7

s8

Coordinate

(11, 7)

(13, 7)

(13, 9)

(11, 9)

Shelf

s9

s10

s11

s12

Coordinate

(9, 9)

(7, 9)

(5, 9)

(3, 9)

Shelf

s13

s14

s15

s16

Coordinate

(3, 11)

(5, 11)

(7, 11)

(9, 11)

Shelf

s17

s18

s19

s20

Coordinate

(11, 11)

(13, 11)

(13, 13)

(11, 13)

Shelf

s21

s22

s23

s24

Coordinate

(9, 13)

(7, 13)

(5, 13)

(3, 13)

Picking platform

t1

t2

t3

Coordinate

(4, 3)

(8, 3)

(12, 3)