! the basic net is for "no frills" hydrogen and helium burning.
      ! assumes T is low enough so can ignore advanced burning and hot cno issues.

! isotopes 

      add_isos_and_reactions(
         h1,
         he3,
         he4,
         li7,
         be7,
         b8,
         b11,
         c12,
         c13,
         c14,
         n13,
         n14,
         n15,
         o14,
         o15,
         o16,
         o17,
         o18,
         f17,
         f18,
         f19,
         ne18,
         ne19,
         ne20,
         ne21,
         ne22,
         na20,
         na21,
         na22,
         na23,
         mg21,
         mg22,
         mg23,
         mg24,
         mg25,
         mg26,
         al23,
         al24,
         al25,
         al26,
         al27,
         si24,
         si25,
         si26,
         si27,
         si28,
         si29,
         si30
           )     

      add_reactions(
         rpep_to_he3,
         rpp_to_he3,
         r_he3_ag_be7,
         r_be7_ec_li7,
         r_li7_pa_he4,
         r_be7_pg_b8,
         r_b8_wk_he4_he4,
         r_b8_gp_be7,
         r_he3_be7_to_h1_h1_he4_he4
           )

      remove_reactions(
         r_he4_he4_he4_to_c12,
         r_c12_to_he4_he4_he4,
         r_c12_ap_n15, 
         r_c12_ag_o16,
         r_n13_ap_o16,
         r_n13_gp_c12,
         r_n14_ap_o17,
         r_n14_ag_f18,
         r_n14_gp_c13,
         r_n15_ap_o18,
         r_n15_gp_c14,
         r_o14_ag_ne18,
         r_o14_ap_f17,
         r_o14_gp_n13,
         r_o15_ap_f18,
         r_o15_ag_ne19, 
         r_o15_gp_n14,
         r_o16_ap_f19,
         r_o16_ag_ne20,
         r_o16_ga_c12,
         r_o16_gp_n15,
         r_o17_ag_ne21,
         r_o18_ag_ne22,
         r_f17_ap_ne20,
         r_f17_gp_o16,
         r_f18_ap_ne21,
         r_f18_gp_o17,
         r_f19_ap_ne22,
         r_f19_gp_o18,
         r_ne18_gp_f17,
         r_ne19_gp_f18,
         r_ne19_ga_o15,
         r_ne20_ag_mg24,
         r_ne20_ga_o16,
         r_ne20_ap_na23,
         r_ne20_gp_f19,
         r_ne22_ag_mg26,
         r_ne22_ga_o18,
         r_na23_ap_mg26,
         r_na23_gp_ne22,
         r_mg24_ap_al27,
         r_mg24_ag_si28,
         r_mg24_ga_ne20,
         r_mg24_gp_na23,
         r_mg26_ag_si30,
         r_al27_ap_si30,
         r_al27_gp_mg26,
         r_si28_ga_mg24,
         r_si28_gp_al27,
         r_si30_ga_mg26,
         r_c14_ag_o18,
         r_n15_ag_f19,
         r_n15_gp_c14,
         r_o18_ga_c14,
         r_f18_ga_n14,
         r_f19_ga_n15,
         r_ne18_ga_o14,
         r_c12_c12_to_he4_ne20,
         r_he4_ne20_to_c12_c12,
         r_ne21_ga_o17,
         r_na20_gp_ne19,
         r_na21_gp_ne20,
         r_f17_ag_na21,
         r_na21_ga_f17,
         r_ne18_ap_na21,
         r_na22_gp_ne21,
         r_f18_ag_na22,
         r_na22_ga_f18,
         r_ne19_ap_na22,
         r_c12_c12_to_h1_na23,
         r_h1_na23_to_c12_c12,
         r_f19_ag_na23,
         r_na23_ga_f19,
         r_na20_gp_ne19,
         r_mg21_gp_na20,
         r_mg21_gp_na20,
         r_na21_gp_ne20,
         r_mg22_gp_na21,
         r_ne18_ag_mg22,
         r_mg22_ga_ne18,
         r_mg22_gp_na21,
         r_na22_gp_ne21,
         r_mg23_gp_na22,
         r_ne19_ag_mg23,
         r_mg23_ga_ne19,
         r_na20_ap_mg23,
         r_mg23_gp_na22,
         r_c12_o16_to_he4_mg24,
         r_he4_mg24_to_c12_o16,
         r_na21_ap_mg24,
         r_ne21_ag_mg25,
         r_mg25_ga_ne21,
         r_na22_ap_mg25,
         r_mg26_ga_ne22,
         r_al23_gp_mg22,
         r_al23_gp_mg22,
         r_al24_gp_mg23,
         r_na20_ag_al24,
         r_al24_ga_na20,
         r_mg21_ap_al24,
         r_al24_gp_mg23,
         r_al25_gp_mg24,
         r_na21_ag_al25,
         r_al25_ga_na21,
         r_mg22_ap_al25,
         r_al25_gp_mg24,
         r_al26_gp_mg25,
         r_na22_ag_al26,
         r_al26_ga_na22,
         r_mg23_ap_al26,
         r_al26_gp_mg25,
         r_c12_o16_to_h1_al27,
         r_h1_al27_to_c12_o16,
         r_na23_ag_al27,
         r_al27_ga_na23,
         r_si24_gp_al23,
         r_si24_gp_al23,
         r_si25_gp_al24,
         r_si25_gp_al24,
         r_mg21_ag_si25,
         r_si25_ga_mg21,
         r_si26_gp_al25,
         r_mg22_ag_si26,
         r_si26_ga_mg22,
         r_al23_ap_si26,
         r_si26_gp_al25,
         r_si27_gp_al26,
         r_mg23_ag_si27,
         r_si27_ga_mg23,
         r_al24_ap_si27,
         r_si27_gp_al26,
         r_o16_o16_to_he4_si28,
         r_he4_si28_to_o16_o16,
         r_c12_ne20_to_he4_si28,
         r_he4_si28_to_c12_ne20,
         r_al25_ap_si28,
         r_mg25_ag_si29,
         r_si29_ga_mg25,
         r_al26_ap_si29
           )