diff --git a/sky130/openlane/sky130_fd_sc_hd/drc_exclude.cells b/sky130/openlane/sky130_fd_sc_hd/drc_exclude.cells
index 4f6c50a..0e086e8 100644
--- a/sky130/openlane/sky130_fd_sc_hd/drc_exclude.cells
+++ b/sky130/openlane/sky130_fd_sc_hd/drc_exclude.cells
@@ -4,6 +4,7 @@
 sky130_fd_sc_hd__buf_16
 sky130_fd_sc_hd__clkdlybuf4s15_1
 sky130_fd_sc_hd__clkdlybuf4s18_1
+sky130_fd_sc_hd__fa_4
 sky130_fd_sc_hd__lpflow_bleeder_1
 sky130_fd_sc_hd__lpflow_clkbufkapwr_1
 sky130_fd_sc_hd__lpflow_clkbufkapwr_16
@@ -38,6 +39,7 @@
 sky130_fd_sc_hd__lpflow_lsbuf_lh_isowell_tap_1
 sky130_fd_sc_hd__lpflow_lsbuf_lh_isowell_tap_2
 sky130_fd_sc_hd__lpflow_lsbuf_lh_isowell_tap_4
+sky130_fd_sc_hd__mux4_4
 sky130_fd_sc_hd__o21ai_0
 sky130_fd_sc_hd__o311ai_0
 sky130_fd_sc_hd__or2_0
diff --git a/sky130/openlane/sky130_fd_sc_hd/no_synth.cells b/sky130/openlane/sky130_fd_sc_hd/no_synth.cells
index ac9b6e2..a0f554b 100644
--- a/sky130/openlane/sky130_fd_sc_hd/no_synth.cells
+++ b/sky130/openlane/sky130_fd_sc_hd/no_synth.cells
@@ -152,8 +152,6 @@
 sky130_fd_sc_hd__dfxtp_1
 sky130_fd_sc_hd__ebufn_1
 sky130_fd_sc_hd__inv_1
-sky130_fd_sc_hd__mux2_1
-sky130_fd_sc_hd__mux4_1
 sky130_fd_sc_hd__nand2_1
 sky130_fd_sc_hd__nand2b_1
 sky130_fd_sc_hd__nand3_1
diff --git a/sky130/openlane/sky130_fd_sc_hdll/drc_exclude.cells b/sky130/openlane/sky130_fd_sc_hdll/drc_exclude.cells
index 3c8e9c3..b6548b4 100644
--- a/sky130/openlane/sky130_fd_sc_hdll/drc_exclude.cells
+++ b/sky130/openlane/sky130_fd_sc_hdll/drc_exclude.cells
@@ -6,6 +6,7 @@
 sky130_fd_sc_hdll__buf_16
 sky130_fd_sc_hdll__clkdlybuf4s15_1
 sky130_fd_sc_hdll__clkdlybuf4s18_1
+sky130_fd_sc_hdll__fa_4
 sky130_fd_sc_hdll__lpflow_bleeder_1
 sky130_fd_sc_hdll__lpflow_clkbufkapwr_1
 sky130_fd_sc_hdll__lpflow_clkbufkapwr_16
diff --git a/sky130/openlane/sky130_fd_sc_hdll/no_synth.cells b/sky130/openlane/sky130_fd_sc_hdll/no_synth.cells
index 48bd20d..a17838f 100644
--- a/sky130/openlane/sky130_fd_sc_hdll/no_synth.cells
+++ b/sky130/openlane/sky130_fd_sc_hdll/no_synth.cells
@@ -155,8 +155,6 @@
 sky130_fd_sc_hdll__dfxtp_1
 sky130_fd_sc_hdll__ebufn_1
 sky130_fd_sc_hdll__inv_1
-sky130_fd_sc_hdll__mux2_1
-sky130_fd_sc_hdll__mux4_1
 sky130_fd_sc_hdll__nand2_1
 sky130_fd_sc_hdll__nand2b_1
 sky130_fd_sc_hdll__nand3_1
diff --git a/sky130/openlane/sky130_fd_sc_hs/drc_exclude.cells b/sky130/openlane/sky130_fd_sc_hs/drc_exclude.cells
index 6f05d14..c6f4d3a 100644
--- a/sky130/openlane/sky130_fd_sc_hs/drc_exclude.cells
+++ b/sky130/openlane/sky130_fd_sc_hs/drc_exclude.cells
@@ -4,6 +4,7 @@
 sky130_fd_sc_hs__buf_16
 sky130_fd_sc_hs__clkdlybuf4s15_1
 sky130_fd_sc_hs__clkdlybuf4s18_1
+sky130_fd_sc_hs__fa_4
 sky130_fd_sc_hs__lpflow_bleeder_1
 sky130_fd_sc_hs__lpflow_clkbufkapwr_1
 sky130_fd_sc_hs__lpflow_clkbufkapwr_16
@@ -38,6 +39,7 @@
 sky130_fd_sc_hs__lpflow_lsbuf_lh_isowell_tap_1
 sky130_fd_sc_hs__lpflow_lsbuf_lh_isowell_tap_2
 sky130_fd_sc_hs__lpflow_lsbuf_lh_isowell_tap_4
+sky130_fd_sc_hs__mux4_4
 sky130_fd_sc_hs__o21ai_0
 sky130_fd_sc_hs__o311ai_0
 sky130_fd_sc_hs__or2_0
diff --git a/sky130/openlane/sky130_fd_sc_hs/no_synth.cells b/sky130/openlane/sky130_fd_sc_hs/no_synth.cells
index 5d83a20..0e8224b 100644
--- a/sky130/openlane/sky130_fd_sc_hs/no_synth.cells
+++ b/sky130/openlane/sky130_fd_sc_hs/no_synth.cells
@@ -155,8 +155,6 @@
 sky130_fd_sc_hs__dfxtp_1
 sky130_fd_sc_hs__ebufn_1
 sky130_fd_sc_hs__inv_1
-sky130_fd_sc_hs__mux2_1
-sky130_fd_sc_hs__mux4_1
 sky130_fd_sc_hs__nand2_1
 sky130_fd_sc_hs__nand2b_1
 sky130_fd_sc_hs__nand3_1
diff --git a/sky130/openlane/sky130_fd_sc_ls/drc_exclude.cells b/sky130/openlane/sky130_fd_sc_ls/drc_exclude.cells
index 73fb204..8a1a3da 100644
--- a/sky130/openlane/sky130_fd_sc_ls/drc_exclude.cells
+++ b/sky130/openlane/sky130_fd_sc_ls/drc_exclude.cells
@@ -4,6 +4,7 @@
 sky130_fd_sc_ls__buf_16
 sky130_fd_sc_ls__clkdlybuf4s15_1
 sky130_fd_sc_ls__clkdlybuf4s18_1
+sky130_fd_sc_ls__fa_4
 sky130_fd_sc_ls__inputiso0n_1
 sky130_fd_sc_ls__inputiso1p_1
 sky130_fd_sc_ls__lpflow_bleeder_1
@@ -40,6 +41,7 @@
 sky130_fd_sc_ls__lpflow_lsbuf_lh_isowell_tap_1
 sky130_fd_sc_ls__lpflow_lsbuf_lh_isowell_tap_2
 sky130_fd_sc_ls__lpflow_lsbuf_lh_isowell_tap_4
+sky130_fd_sc_ls__mux4_4
 sky130_fd_sc_ls__muxb16to1_4
 sky130_fd_sc_ls__o21ai_0
 sky130_fd_sc_ls__o311ai_0
diff --git a/sky130/openlane/sky130_fd_sc_ls/no_synth.cells b/sky130/openlane/sky130_fd_sc_ls/no_synth.cells
index 957ed8e..35ca0f2 100644
--- a/sky130/openlane/sky130_fd_sc_ls/no_synth.cells
+++ b/sky130/openlane/sky130_fd_sc_ls/no_synth.cells
@@ -158,8 +158,6 @@
 sky130_fd_sc_ls__dfxtp_1
 sky130_fd_sc_ls__ebufn_1
 sky130_fd_sc_ls__inv_1
-sky130_fd_sc_ls__mux2_1
-sky130_fd_sc_ls__mux4_1
 sky130_fd_sc_ls__nand2_1
 sky130_fd_sc_ls__nand2b_1
 sky130_fd_sc_ls__nand3_1
diff --git a/sky130/openlane/sky130_fd_sc_ms/drc_exclude.cells b/sky130/openlane/sky130_fd_sc_ms/drc_exclude.cells
index fb9e3be..0b1a380 100644
--- a/sky130/openlane/sky130_fd_sc_ms/drc_exclude.cells
+++ b/sky130/openlane/sky130_fd_sc_ms/drc_exclude.cells
@@ -1,6 +1,7 @@
 sky130_fd_sc_ms__a2111oi_0
 sky130_fd_sc_ms__a21boi_0
 sky130_fd_sc_ms__and2_0
+sky130_fd_sc_ms__fa_4
 sky130_fd_sc_ms__lpflow_bleeder_1
 sky130_fd_sc_ms__lpflow_clkbufkapwr_1
 sky130_fd_sc_ms__lpflow_clkbufkapwr_16
@@ -35,6 +36,7 @@
 sky130_fd_sc_ms__lpflow_lsbuf_lh_isowell_tap_1
 sky130_fd_sc_ms__lpflow_lsbuf_lh_isowell_tap_2
 sky130_fd_sc_ms__lpflow_lsbuf_lh_isowell_tap_4
+sky130_fd_sc_ms__mux4_4
 sky130_fd_sc_ms__o21ai_0
 sky130_fd_sc_ms__o311ai_0
 sky130_fd_sc_ms__or2_0
diff --git a/sky130/openlane/sky130_fd_sc_ms/no_synth.cells b/sky130/openlane/sky130_fd_sc_ms/no_synth.cells
index 7c1c45f..424ea3e 100644
--- a/sky130/openlane/sky130_fd_sc_ms/no_synth.cells
+++ b/sky130/openlane/sky130_fd_sc_ms/no_synth.cells
@@ -155,8 +155,6 @@
 sky130_fd_sc_ms__dfxtp_1
 sky130_fd_sc_ms__ebufn_1
 sky130_fd_sc_ms__inv_1
-sky130_fd_sc_ms__mux2_1
-sky130_fd_sc_ms__mux4_1
 sky130_fd_sc_ms__nand2_1
 sky130_fd_sc_ms__nand2b_1
 sky130_fd_sc_ms__nand3_1