The font for this test case has an AAT Extended Glyph Metamorphosis Table with a single Contextual Glyph Substitution Subtable. Its finite-state machine contains two states (0 and 1). In state 0, glyph A moves to state 1 with a transition carrying the SetMark flag; other glyphs have no effect. In state 1, glyphs B, C, D, E replace both the current and the marked glyph by an encircled form; other glyphs have no effect.