Table 5.

The reachable set, antecedent set and collective set of factors.

Factor	Reachable Set	Antecedent Set	Collective Set	Layers
S1	S1–S4	S1, S5, S6, S9, S17, S18, S20, S22	S1	L3
S2	S2, S4, S7	S1, S2, S5, S6, S17, S18, S20, S22	S2	L3
S3	S3	S1, S3, S5, S6, S17−S20, S22	S3	L1
S4	S4	S1−S9, S11, S13−S22	S4	L1
S5	S1–S8, S10–S12, S19, S21	S5, S6, S17, S18, S20, S22	S5, S6	L4
S6	S1–S8, S10–S12, S21	S5, S6, S9, S17−S20, S22	S5, S6	L4
S7	S4, S7, S10–S12	S2, S5−S7, S9, S13, S17−S20, S22	S7	L3
S8	S4, S8, S10−S12, S21	S5, S6, S8, S17−S20, S22	S8	L3
S9	S1, S4, S6, S7, S9, S10−S15, S17−S21	S9	S9	L5
S10	S10	S5−S10, S12, S13, S17−S21	S10	L1
S11	S11	S5−S9, S11−S13, S17−S22	S11	L1
S12	S10, S11, S12, S21	S5−S9, S12, S13, S17, S18−S22	S12, S21	L3
S13	S4, S7, S10−S13, S21	S9, S13, S21	S13, S21	L3
S14	S4, S14, S21	S9, S14	S14	L3
S15	S4, S15	S9, S15	S15	L2
S16	S4, S16	S16	S16	L2
S17	S1−S8, S10−S12, S17−S21	S9, S17, S20	S17, S20	L5
S18	S1−S8, S10−S12, S18−S21	S9, S17, S18, S20, S22	S18, S20	L5
S19	S3−S8, S10−S12, S19, S21	S5, S9, S17−S20, S22	S19	L4
S20	S1−S8, S10−S12, S17−S21	S9, S17, S18, S20, S22	S17, S18, S20, S22	L5
S21	S4, S10−S13, S21	S5, S6, S8, S9, S12−S14, S17 −S22	S13, S21	L3
S22	S1−S8, S11, S12, S18−S22	S22	S22	L5