* spellcheck CG1G2G1G2.
* checked the glide reflection of TCCTGG. added NOTES to TCCTGG about
how it is constructed. added a dash line AD.
* checked the glide reflection of TCTGG. added NOTES to TCTGG about how
it is constructed.
* checked the glide reflection of CCGG. added NOTES to CGG about how it
is constructed.