QUESTION: Fix punctuation: If the sequences ended then the sum could defined in terms of starting with the rightmost digits and expressing the sum in terms of the carry operation
ANS: If the sequences ended then the sum could defined in terms of starting with the right-most digits and expressing the sum in terms of the carry operation.

QUESTION: Fix punctuation: United in LoveA Convention in Frankfurt Germany
ANS: United in LoveA Convention in Frankfurt, Germany

QUESTION: Fix punctuation: 3 years ago 3832 xHamster British group cumshot
ANS: 3 years ago 38:32 xHamster British, group, cumshot

QUESTION: Fix punctuation: PEN International is saddened deeply worried and angry over the continued violence against journalists and writers and particularly over the impunity which prevails despite numerous assurances of investigation and respect for freedom of expression
ANS:
PEN International is saddened, deeply worried and angry over the continued violence against journalists and writers, and particularly over the impunity which prevails despite numerous assurances of investigation and respect for freedom of expression.