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Terminal: run. Derivation Graphs: (left-to-right) compact / full; (top-down) full / compact.

Help: blue = parse inside. Abbr.: WS: Workspace; Initial WS: initial heads for Merge after LEX lookup.

WS n, n = 1,2,... for intermediate stages after Initial WS. Final WS: when WS items converge on a single SO.
Bracketing: {...} (Merge). {...} (FormSet). At Spellout, {...} indicates free word order. [word] indicates word is optionally present.
Head Hd_{selection/features}, e.g. p_θ = predicate head p that seeks a θ-relevant (θR) IA from the WS. p_θ is a θ-seeker (θS).
v_see:θ:pst = head v has complement see, a θR EA from the WS and TNS. v is also a θS.
INFL seeks θR from its complement (not the WS).
Complementizer C comes in different flavors wrt. Force, .e.g. declarative C, interrogative C_Q and relative clause head C_rel.
Features, e.g. TNS pres/pst or DET the/a (shorthand for a bundle of semantic features).
Note: φ-features, e.g. 1sg, appear only at Spellout. Some words do not project, turn into features, e.g. determiners.

Words: me gustan los libros

Initial WS 1: libros appl_θ gustar_appl:_θ v_gustar:_pres INFL_v:_2pl me

Initial WS 2: libros_los appl_θ gustar_appl:_θ v_gustar:_pres INFL_v:_2pl me

Initial WS 3: libros appl_θ gustar_appl:_θ v_gustar:_pres INFL_v:_3pl me

Initial WS 4: libros_los appl_θ gustar_appl:_θ v_gustar:_pres INFL_v:_3pl me

Initial WS 5: libros appl_θ gustar_appl:_θ:_me v_gustar:_pres INFL_v:_2pl

Initial WS 6: libros_los appl_θ gustar_appl:_θ:_me v_gustar:_pres INFL_v:_2pl

Initial WS 7: libros appl_θ gustar_appl:_θ:_me v_gustar:_pres INFL_v:_3pl

Initial WS 8: libros_los appl_θ gustar_appl:_θ:_me v_gustar:_pres INFL_v:_3pl

Initial WS 9: libros_los appl_θ:_me gustar_appl:_θ v_gustar:_pres INFL_v:_2pl

WS 1: {appl_θ:_me, pro_:_{1sg-_32900}} libros_los gustar_appl:_θ v_gustar:_pres INFL_v:_2pl

WS 2: {gustar_appl:_θ, {appl_θ:_me, pro_:_{1sg-_32900}}} libros_los v_gustar:_pres INFL_v:_2pl

WS 3: {libros_los, {gustar_appl:_θ, {appl_θ:_me, pro_:_{1sg-_32900}}}} v_gustar:_pres INFL_v:_2pl

WS 4: {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, pro_:_{1sg-_482}}}}} INFL_v:_2pl

WS 1: {appl_θ:_me, libros_los} gustar_appl:_θ v_gustar:_pres INFL_v:_2pl

WS 2: {gustar_appl:_θ, {appl_θ:_me, libros_los}} v_gustar:_pres INFL_v:_2pl

WS 3: {libros_los, {gustar_appl:_θ, {appl_θ:_me, libros_los}}} v_gustar:_pres INFL_v:_2pl

WS 4: {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, libros_los}}}} INFL_v:_2pl

Initial WS 10: libros_los appl_θ:_me gustar_appl:_θ v_gustar:_pres INFL_v:_3pl

WS 1: {appl_θ:_me, pro_:_{1sg-_3780}} libros_los gustar_appl:_θ v_gustar:_pres INFL_v:_3pl

WS 2: {gustar_appl:_θ, {appl_θ:_me, pro_:_{1sg-_3780}}} libros_los v_gustar:_pres INFL_v:_3pl

WS 3: {libros_los, {gustar_appl:_θ, {appl_θ:_me, pro_:_{1sg-_3780}}}} v_gustar:_pres INFL_v:_3pl

WS 4: {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, pro_:_{1sg-_3780}}}}} INFL_v:_3pl

WS 5: {INFL_v:_3pl, {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, pro_:_{1sg-_3780}}}}}}

Final WS: {C, {INFL_v:_3pl, {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, pro_:_{1sg-_3780}}}}}}}

INT/EXT: {C, {INFL_v:_3pl, {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, pro_:_{1sg-_3780}}}}}}}

EXT: los libros 3pl-m pres gustar cl_me

Spellout: los libros me gustan

Blocked: inconsistent with input!

EXT: 3pl-m pres gustar los libros cl_me

Spellout: me gustan los libros

Parse found: 3pl-m pres gustar los libros cl_me

WS 1: {appl_θ:_me, libros_los} gustar_appl:_θ v_gustar:_pres INFL_v:_3pl

WS 2: {gustar_appl:_θ, {appl_θ:_me, libros_los}} v_gustar:_pres INFL_v:_3pl

WS 3: {libros_los, {gustar_appl:_θ, {appl_θ:_me, libros_los}}} v_gustar:_pres INFL_v:_3pl

WS 4: {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, libros_los}}}} INFL_v:_3pl

WS 5: {INFL_v:_3pl, {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, libros_los}}}}}

Final WS: {C, {INFL_v:_3pl, {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, libros_los}}}}}}

INT/EXT: {C, {INFL_v:_3pl, {v_gustar:_pres, {libros_los, {gustar_appl:_θ, {appl_θ:_me, libros_los:}}}}}}

Error: Case: object "libros_los" not DAT