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process
begin
if rising_edge(clk) then
a <= input;
b <= a;
c <= b;
output <= c;
end if;
end process;
process
begin
if rising_edge(clk) then
output <= c;
c <= b;
b <= a;
a <= input;
end if;
end process;
process
begin
if rising_edge(clk) then
a := input;
b := a;
c := b;
output <= c;
end if;
end process;
process
begin
if rising_edge(clk) then
output <= c;
c := b;
b := a;
a := input;
end if;
end process;