With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Some of South America's countries are republics.
text_B: teTeX is a TeX distribution for Unix-like systems .. Unix-like. Unix-like. TeX. TeX. As of May 2006 , teTeX is no longer actively maintained and its former maintainer Thomas Esser recommended TeX Live as the replacement .. TeX. TeX. TeX Live. TeX Live. The teTeX package is available as a package for system architectures  :. Linux -LRB- x86 , SPARC , PowerPC , Alpha -RRB-. Linux. Linux. x86. x86. SPARC. SPARC. PowerPC. PowerPC. Alpha. DEC Alpha. Mac OS X -LRB- x86 , PowerPC -RRB-. x86. x86. PowerPC. PowerPC. Mac OS X. Mac OS X. Solaris -LRB- x86 , SPARC -RRB-. x86. x86. SPARC. SPARC. Solaris. Solaris ( operating system ). Other supported operating systems include  :. OpenBSD and FreeBSD -LRB- on x86 architectures -RRB-. x86. x86. OpenBSD. OpenBSD. FreeBSD. FreeBSD. IBM AIX on -LRB- RS / 6000 -RRB-. IBM AIX. IBM AIX. HP-UX -LRB- on HPPA -RRB-. HP-UX. HP-UX. Microsoft Windows -LRB- on 32-bit systems -RRB-. Microsoft Windows. Microsoft Windows. BeOS -LRB- for Intel x86 -RRB-. x86. x86. BeOS. BeOS
not_related.