The first four signals are, in order, Denon-K: {D=4,S=1,F=2},
Denon-K: {D=4,S=1,F=3},
Denon: {D=2,F=225} and
Denon: {D=2,F=226} (using IrScrutinizer).

The final one is a bit funny: It consists of two copies of Denon: {D=2,F=193}, as an intro signal.
Instead, the Denon signal consists of a repeat signal, with no intro. The funny-ness of your signal is probably due to imperfect learning software. The "normal" Denon D=2,F=193 looks like

0000 006D 0000 0020 000A 001E 000A 0046 000A 001E 000A 001E 000A 001E 000A 001E 000A 0046 000A 001E 000A 001E 000A 001E 000A 0046 000A 0046 000A 0046 000A 001E 000A 001E 000A 0677 000A 001E 000A 0046 000A 001E 000A 001E 000A 001E 000A 0046 000A 001E 000A 0046 000A 0046 000A 0046 000A 001E 000A 001E 000A 001E 000A 0046 000A 0046 000A 0677

Try it, I believe it should work if you hold down the key for half a second or so.