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PLOT POINTS ☆☆☆

`PLOT POINTS: x , y`
draws a point marker at (x,y), where x,y are numeric expressions.

Two or more points can be written separated by semicolons as follows.
`PLOT POINTS: x0, y0; x1, y1; x2, y2`

`SET POINT STYLE numeric_expression`
indicates the marker style.
The marker styles are 1 for ・, 2 for ＋, 3 for ＊, 4 for ○, 5 for ×, 6 for ■, 7 for ●.
The default point style is 3.
The point styles 6 and 7 are original enhancements.
`SET POINT COLOR color_index`
sets the color index that PLOT TEXT statements use, where color_index is a numeric expression.
The default point color is 1.

`ASK POINT COLOR n`
assigns current point color to a numeric variable n.
`ASK POINT STYLE n`
assigns the current point style to a numeric variable n.
`ASK MAX POINT STYLE n`
assigns the largest point style to a numeric variable n.
On this version, 7 is always assigned to n.