indicating disregard to an instructor
murdering a Brahmana
Taking endlessly the riches
Mahapatakas can't be killed or washed away without experiencing their results.
2. Upapatakas(secondary sins)
selling inebriating drinks.
bringing about the disappointment of one's master.
giving bogus observer, making bogus cases.
disregarding the pledge of abstinence (brahmacharya)
cutting of trees.
taking cash for showing the Vedas,
3. Prakirna patakas. (Minor sins)
slaughtering a lady.
contemplating taboo Shastras.
slaughtering creepy crawlies.
brutality to guardians
wedding the more youthful child before wedding the senior one
Prakirna patakas can be washed away formally by performing penances and expiatory services (prayaschitta) or by communicating regret and looking for absolution.