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His mother 's memory tore at his heart because she had died loving him , when he was too young and selfish to love her in return , and because somehow , he did not remember how , she had sacrificed herself to a conception of loyalty that was private and unalterable . gold

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(SENTENCE
  (CLAUSE
    (CORE
      (NP
        (NPIP (NP (OP-DEF 0=His) (CORE_N (NUC_N (N 1=mother))) (POS 2='s)))
        (CORE_N (NUC_N (N 3=memory))))
      (NUC (V 4=tore))
      (PP
        (CORE_P (NUC_P (P 5=at)) (NP (OP-DEF 6=his) (CORE_N (NUC_N (N 7=heart)))))))
    (CLAUSE-PERI
      (CLM 8=because)
      (CORE
        (NP (PRO 9=she))
        (NUC (V 11=died))
        (CORE-PERI (NUC (V 12=loving)) (NP (PRO 13=him)))
        (CLAUSE-PERI
          (, 14=,)
          (CLM 15=when)
          (CORE
            (CORE
              (NP (PRO 16=he))
              (NUC
                (AUX-TNS 17=was)
                (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 18=too))))
                (NUC (A 19=young))
                (NUC (CLM 20=and) (A 21=selfish))))
            (CORE
              (CLM 22=to)
              (NUC (V 23=love))
              (NP (PRO 24=her))
              (PP-PERI
                (CORE_P (NUC_P (P 25=in)) (NP (CORE_N (NUC_N (N 26=return))))))))))
      (OP-TNS 10=had)
      (, 27=,))
    (CLAUSE-PERI
      (CLM 28=and)
      (CLM 29=because)
      (PrDP (ADVP-WH (ADV-WH 30=somehow)))
      (CLAUSE-PERI
        (, 31=,)
        (CORE
          (NP (PRO 32=he))
          (OP-NEG 34=not)
          (NUC (V 35=remember))
          (ADVP-WH (ADV-WH 36=how)))
        (OP-TNS 33=did)
        (, 37=,))
      (CORE
        (NP (PRO 38=she))
        (NUC (V 40=sacrificed))
        (NP (PRO 41=herself))
        (PP
          (P 42=to)
          (NP
            (OP-DEF 43=a)
            (CORE_N
              (NUC_N
                (N 44=conception)
                (CLAUSE-PERI
                  (PrCS (NP-REL (PRO-REL 47=that)))
                  (CORE
                    (NUC
                      (AUX-TNS 48=was)
                      (NUC (A 49=private))
                      (NUC (CLM 50=and) (A 51=unalterable))))))
              (PP (P 45=of) (NP (CORE_N (NUC_N (N 46=loyalty)))))))))
      (OP-TNS 39=had)))
  (. 52=.))