R[X
2019N11
y
@ @ @ @ @ 1 2
@@@@@
---
---
3 4 5 6 7 8 9
---
---
---
---
---
---
---
10 11 12 13 14 15 16
---
---
---
---
---
---
---
17 18 19 20 21 22 23
~
~
~
24 25 26 27 28 29 30
~
x
~