a6 = 1,2,3,4,5,6,7,8,9,10…16
a7 = 1,2,3,4,5,6,7,8,9,10

a8 = a7[5]

//startshape CIRCLE[s pick6(a6) 1]
//startshape CIRCLE[s pick6(a7) 1]
//startshape CIRCLE[s a6[5] 1]
startshape CIRCLE[s a7[5] 1]

pick6(vector10 foo) = foo[5]
//pick6(vector010 foo) = foo[5]
//pick6(vector100 foo) = foo[5]
