CP recursion

Like CP recursion in PPCME/PPCEME:

(CP-THT (C that)
        (CP-THT (TOPIC-1 ...)
                (C that)
                (IP-SUB (TOPIC *ICH*-1)
                        ...)))

Icelandic example:

	  (PP (P svo-svo)
	      (CP-ADV (C að-að)
		      (CP-ADV (PP-1 (P ef-ef)
				    (CP-ADV (C 0)
					    (IP-SUB (NP-SBJ (PRO-N hann-hann))
						    (VBDS fyndi-finna)
						    (ADVP-LOC (ADV þar-þar))
						    (NP-OB1 (Q-A nokkra-nokkur)
							    (NP-POS (D-G þess-sá) (N-G vegar-vegur))
							    (, ,-,)
							    (NP-PRN (NS-A karla-karl) (CONJ eða-eða) (NS-A kvinnur-kvinna))))))
			      (, ,-,)
			      (C að-að)
			      (IP-SUB (PP *ICH*-1)
				      (NP-SBJ (PRO-N hann-hann))
				      (VBDI færði-færa)
				      (IP-PPL-OB1 (NP-SBJ (PRO-A þá-þá))
						  (VAN bundna-binda))
				      (PP (P til-til)
					  (NP (NPR-G Jerúsalem-jerúsalem)))))))
	  (. .-.))
  (ID 1540.NTACTS.REL-BIB,254.501))