Any bright ideas on these...?

Question

Need the next letter in the sequence, for Comp.

G.E.L.N.D........ T.N.E.S.S. ........ R.O.Y.G.B. ........

CA. AB. JS. AC. CH. ........... C.CS.D.DS.E. .........

L. M. M. J. V. ............ R.Y.G.B.B. .........

A.T.G.C. ............ AL.AK.AZ. .........

Any help much appreciated. THANK YOU.

Answer 1

ROYGBIV (colors in rainbow)

Answer 2

GELND is GELNDJ: Bible books: Genesis, Exodus, Leviticus, Numbers, Deuteronomy, Joshua.

TNESS is TNESSF: Ten, nine, eight, seven, six, five.

ROYGB is ROYGBI: Visible color spectrum: Red, orange, yellow, green, blue, indigo.

CA AB JS AC CH is CA AB JS AC CH CP: Henry VIII's wives in chron. order: Catherine of Aragon, Anne Boleyn, Jane Seymour, Anne of Cleves, Catherine Howard, Catherine Parr.

C.CS.D.DS.E is C.CS.D.DS.E.ES: Lava zip5 functions.

L. M. M. J. V. is L. M. M. J. V. S.: French days of the week: Lundi, Mardi, Mercredi, Jeudi, Vendredi, Samedi.

RYGBB is RYGBBW: Only partially sure, colors again?: Red, Yellow, Green, Blue, Black, White.

A.T.G.C. is A.T.G.C.U: Amino acid bases: Adenine, Thymine, Guanine, Cytosine, Uracil.

AL.AK.AZ. is AL.AK.AZ.AR.: US State abbreviations: Alabama, Alaska, Arizona, Arkansas.