Nested simple columns

Hello Tom,

I'm splitting the available screen space into two columns

[ lgc_column grid="70" tablet_grid="50" mobile_grid="100" last="false" ]

[ /lgc_column ]

I'd then like to split that first column that is 70% of the space into three other columns. Can I nest these statements? I'm trying and I think it's getting confused with the last="true" statement.

I don't know why the code isn't showing. I'm using the code button on the toolbar to open and close it.