How to Determine Priority for a Second Chiral Center?

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Destroxia
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Homework Statement



Fischer projection of a sugar with carbons labeled, showing OH and H on each stereocenter, OHC at the top left and CH2OH at the bottom right, with the question 'Is the indicated chiral center R or S?'

The Attempt at a Solution



My issue here is the priority, I know OH has the greatest priority, and H the least, but I really cannot figure out the priority of the other 2 bonded to the carbon... ??
 
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1) both have an -OH, equal; 2) one has another C which outranks the pair of H.