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1
Si+1 =   {true, false, 0}
2-
       È {succ t1, pred t1, iszero t1 | t1 ∈ Si}
2+
Si+2 =   {succ t1, pred t1, iszero t1 | t1 ∈ Si}
3-
       È {if t1 then t2 else t3 | t1, t2, t3 ∈ Si}.
3+
Si+3 =   {if t1 then t2 else t3 | t1, t2, t3 ∈ Si}.