B  
bool_expr [LuckyDraw]  
D  
draw_mode [LuckyDraw] 
To indicate the number of solutions to draw respectively inside,
at edges, and at vertices of the convex hull of numeric
solutions.

F  
float_expr [LuckyDraw]  
I  
int_expr [LuckyDraw]  
S  
solution [LuckyDraw]  
solutions_set [LuckyDraw]  
subst [LuckyDraw]  
V  
value [LuckyDraw]  
var_name [LuckyDraw]  
var_type [LuckyDraw] 