Convert (and simplify if possible) the following sentences to Conjunctive Normal Form (CNF): 2.1. $(\mathrm{P} ightarrow \mathrm{Q} ightarrow((\mathrm{Q} ightarrow \mathrm{R} ightarrow(\mathrm{P} ightarrow \mathrm{R})$ 2.2. $(\mathrm{P} ightarrow \mathrm{0}) \leftrightarrow(\mathrm{P} ightarrow \mathrm{R})$ 2.3. $(\mathrm{P] \wedge \mathrm{Q} ightarrow( eg \mathrm{P} \leftrightarrow \mathrm{Q})$ 2.4. $( eg \mathrm{Q} ightarrow eg \mathrm{P}) ightarrow(\mathrm{P] ightarrow \mathrm{Q})$ CS. JG. 015