A pair positioning lookup may changes the position of two glyph. If the second glyph's position is not changed, after it is applied the lookup will continue its work starting from the second glyph. This is useful for kerning lookups. An example that kerns some Latin glyphs:

lookup kerning {
    pos [A Lambda Delta] [V W Y] -> ,,-100;
    pos V [a e o] -> ,,-120;

The input sequence should contain two glyphs, which may be glyph lists. The positioning data may supply one or two positioning values.