2 | 5. g:Label.
y1 = g  subtype_rel(({a:( [[da]] rho)| tr.proj(g,kind(a)) } List); (rho(lbl_pr( < Trace, g > )))) 6. tr.y1 {a:( [[da]] rho)| tr.proj(y1,kind(a)) } List 7. subtype_rel(({a:( [[da]] rho)| tr.proj(y1,kind(a)) } List); (rho(lbl_pr( < Trace, y1 > )))) ({a:( [[da]] rho)| tr.proj(y1,kind(a)) } List) (rho(lbl_pr( < Trace, y1 > ))) |