I'm into mindmap

Mary: Are you into mindmap?

Nack: Yes. I spend time onto mindmap.

Mary: Oh.

Nack: I bought new color pens to draw mindmap yesterday.

Mary: How many pens did you buy yesterday?

Nack: Hum.... There are 3 pens.

Mary: What colors did you buy?

Nack: Pink, purple, and blue.