• the line at time t = i
• the tab at time t = j
• statement at line i, tab k = s
• k < j
• value at (j - 1) in map (Control Map at time t) = pair ("method", mname)
• Context Stack at time t = [ program context with variables: varis and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]

then the tab at time (t + 1) = tab