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- SANR SAR SARS SAS SASE SAT-chromosome SAT-zone SATB SBA SBN SC and S SCE SCID SCLC SCPO SCS SCSI SDBL SDD SDI SDRAM SDRs SDS SDT SEATO SEO SERM SFC SFM SFPM SGML SGO SHF
- SHQ SHV SID SIDS SIGINT SIM card SIMM SIV SIW SJ SJC SK SKU SKr SL and C SL and T SLAN SLBM SLC SLE SLP SLR SLW SMA SMG SMO SMP SMS SMSA SMSgt SMV SMaj SNCC
- SNF SNG SNLR SNO SNP SOF SOS SPCA SPCC SPF SPO SPQR SPS SQMS SR and CC SR and O SRA dye SRAM SRCC SRM SRN SRO SS and C SS collar SSA SSC SSE SSG SSI SSL SSM SSN SSR