sos 5/7 + -8/7 -13/15 +-12/15 -7/16 tru -5/16 -8/25 tru -17/25 -2/13 + 7/13

sos 5/7 + -8/7 -13/15 +-12/15 -7/16 tru -5/16 -8/25 tru -17/25 -2/13 + 7/13 (dau - la dau am) 5/23 + -5/23 -19/35 + 17/35 -20/31 tru -21/31 205/57 tru -91/57 -123/63 tru 3/63 sos sos sos sos
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