bash, 8580 bytes

printf -v a %s {A..Z};b=`rev<<<$a`;for;for i in {251..026} {125..251};{ echo ${a::-i-1}$`rev<<<${ba::i-1};`;}

bash, 85 bytes

printf -v a %s {A..Z};b=`rev<<<$a`;for i in {25..0} {1..25};{ echo ${a::-i-1}${b:i};}

printf -v a %s {A..Z};for i in {1..26} {25..1};{ echo ${a::i}`rev<<<${a::i-1}`;}

generate $a

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edited Aug 3, 2016 at 9:21

a=ABCDEFGHIJKLMNOPQRSTUVWXYZprintf b=`rev<<<$a`;for-v a %s {A..Z};b=`rev<<<$a`;for i in {25..0} {1..25};{ echo ${a::-i-1}${b:i};}

a=ABCDEFGHIJKLMNOPQRSTUVWXYZ b=`rev<<<$a`;for i in {25..0} {1..25};{ echo ${a::-i-1}${b:i};}

printf -v a %s {A..Z};b=`rev<<<$a`;for i in {25..0} {1..25};{ echo ${a::-i-1}${b:i};}

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created Aug 3, 2016 at 9:14

a=ABCDEFGHIJKLMNOPQRSTUVWXYZ b=`rev<<<$a`;for i in {25..0} {1..25};{ echo ${a::-i-1}${b:i};}