Figure 10.

Example of skip dual encoding. The read of Figure 8 is represented in the skip dual alphabet. The vertical bars above the read indicate non-skipped positions. The symbols ${\downarrow }_{/j}^{-}$ and ${\downarrow }_{/j}^{+}$ (j ≥ 1) have the same meaning as in the dual alphabet. The symbols ⇓_j indicate that both sequences have match length 0 and that the next non-skipped position is located j nucleotides downstream. Other features are as in Figure 8.