Describe the PR system with its types and Nepal's PR design under Article 84.

The rule: the constituency's single seat to the most votes — the plurality, not the majority. Thevirtues: simplicity (the voter's easy act); the constituency's ** MP-and-voter link (thegeographic accountability); the stable two-party-ish systems' tendency (the wasted-votes'squeeze on the small parties — Duverger's Law, by name: FPTP's mechanical-and-psychological push toward two parties); the decisive-and-cheap administration; theexclusion of the extremes' logic. The vices: the disproportionality (the seats-vs-votes gaps— a party's 35% can take the majority); the wasted votes (the losers' millionsunrepresented); the gerrymander's invitation (the map-drawer's mischief — delimitation'sstakes); the minorities' geography-dependence (the spread minority wins nothing; theconcentrated one wins all — Nepal's Madhes representation's old FPTP pattern); the spoiler-and-split dynamics; the majority's own absence (the winner with 30% of theconstituency's mandate — Nepal's fragmented FPTP fields routinely elect onpluralities). Nepal's FPTP:** the 165 constituencies of Article 84(1)(a) — the 1990–1999 House's system, continued as the mixed system's geographic half.