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NEW YORK ( TheStreet) -- Investors need to stick with the big themes that are working, Jim Cramer told "Mad Money" viewers Thursday. He unveiled two more macro themes that he said can be bought on any market weakness. Cramer's first theme: the revolution in American oil and gas. He said this multi-year theme will be a boon for our energy independence, but it will also mean big profits for those companies that use a lot of oil and gas, mainly the chemical and plastics companies. He said stocks including Dow Chemical ( DOW) and PPG ( PPG) remain favorites, as does Georgia Gulf ( GGC), makers of PVC plastics for everything from piping to windows. Cramer was also bullish on refiner Valero ( VLO) and soon-to-be natural gas exporter, Cheniere Energy ( LNG). Cramer's next theme for 2013 was technology, mainly cellphone technology, as every major carrier in the U.S. begins aggressively rolling out their latest 4G networks. Cramer said everyone from SBA Communications ( SBAC) to American Tower ( AMT) to Broadcom ( BRCM), a stock he owns for his charitable trust,