add d1
add d2
add d3
add major feature_a 1
add major feature_a 2
add d4
add d5
add major feature_a 3
feature_b1.txt
feature_b2.txt
hotfix 1
Merge branch 'hotfix'
Merge branch 'hotfix' into develop
d6.txt
Merge branch 'feature_a' into develop
r1.txt
r2.txt
Merge branch 'release' into develop
feature_aa1.txt
feature_aa2.txt