&

1

2

3

,

.

4

.

5

24

2

1 :

()

2

2 :

3

!!!

.

https://www.google.gr/search >

https://www.youtube.com/watch?v=y_E4ztVRhUM

http://www.thejoyofshards.co.uk/projects/grout.shtml

http://www.thejoyofshards.co.uk/projects/pr1step1.shtml

http://www.thejoyofshards.co.uk/projects/