Instruction to play
Draw a tile: 
draw

Add a new meld: 
new R1 R2 R3

Add a tile to a meld on the table: 
add 1 R1 R2

Reuse a tile from a meld on the table:
reuse 1 R1

end is added to the end of all players' actions:
new R1 R2 R3
add 1 G13
new B1 B2 B3
end