Note: Under the terms of the MFJ, the BOCs are generally prohibited from providing services that originate in one LATA and terminate in another.
Source: from Federal Standard 1037C
... SDC[?] SDD[?] SDE[?] SDF SDG[?] SDH SDI SDJ[?] SDK SDL SDM[?] SDN[?] SDO[?] SDP SDQ[?] SDR[?] SDS SDT[?] SDU[?] SDV[?] SDW[?] SDX[?] SDY[?] SDZ[?]
SEA[?] SEB SEC SED ...
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