| Prefixo conhecido do artigo | Número dos artigos | Prefixo conhecido do artigo | Número dos artigos |
| X | 1 | X ( | 28 |
| X 2 | 1 | X A | 1 |
| X B | 1 | X C | 1 |
| X F | 1 | X G | 1 |
| X J | 4 | X L | 1 |
| X M | 2 | X P | 3 |
| X R | 2 | X S | 6 |
| X T | 1 | X V | 1 |
| X W | 1 | X a | 4 |
| X c | 11 | X d | 7 |
| X e | 4 | X f | 10 |
| X g | 2 | X i | 1 |
| X j | 6 | X l | 1 |
| X m | 8 | X n | 1 |
| X o | 3 | X p | 6 |
| X r | 2 | X s | 4 |
| X t | 7 | X u | 1 |
| X v | 2 | X é | 1 |
| X! | 1 | X&Y | 1 |
| X&t | 1 | X'H | 1 |
| X'M | 1 | X'T | 2 |
| X*P | 1 | X, | 2 |
| X-1 | 10 | X-2 | 6 |
| X-3 | 1 | X-4 | 2 |
| X-5 | 1 | X-8 | 1 |
| X-9 | 1 | X-A | 5 |
| X-B | 6 | X-C | 18 |
| X-D | 6 | X-E | 5 |
| X-F | 8 | X-G | 3 |
| X-H | 72 | X-I | 1 |
| X-J | 3 | X-K | 1 |
| X-L | 5 | X-M | 10 |
| X-N | 2 | X-O | 5 |
| X-P | 15 | X-R | 5 |
| X-S | 10 | X-T | 3 |
| X-V | 1 | X-W | 1 |
| X-Z | 1 | X-a | 3 |
| X-b | 1 | X-c | 3 |
| X-d | 1 | X-e | 4 |
| X-f | 1 | X-g | 1 |
| X-h | 1 | X-i | 2 |
| X-k | 2 | X-m | 3 |
| X-n | 1 | X-p | 2 |
| X-q | 1 | X-r | 1 |
| X-t | 8 | X-á | 1 |
| X. | 8 | X.1 | 1 |
| X.2 | 4 | X.3 | 2 |
| X.4 | 2 | X.5 | 4 |
| X.7 | 1 | X.O | 2 |
| X.P | 1 | X.S | 1 |
| X/1 | 2 | X/O | 2 |
| X00 | 1 | X1 | 1 |
| X1 | 2 | X10 | 5 |
| X11 | 5 | X16 | 1 |
| X2 | 1 | X2 | 2 |
| X20 | 1 | X25 | 1 |
| X26 | 1 | X27 | 1 |
| X2X | 1 | X3 | 1 |
| X3 | 3 | X30 | 1 |
| X38 | 2 | X3D | 2 |
| X3J | 1 | X4 | 1 |
| X4 | 1 | X5 | 1 |
| X5 | 1 | X5R | 1 |
| X6 | 1 | X60 | 1 |
| X68 | 2 | X7 | 1 |
| X8 | 1 | X9 | 1 |
| XA | 1 | XA- | 2 |
| XAA | 1 | XAB | 1 |
| XAC | 3 | XAD | 3 |
| XAE | 1 | XAF | 2 |
| XAG | 2 | XAK | 1 |
| XAM | 2 | XAN | 1 |
| XAP | 1 | XAS | 1 |
| XAT | 1 | XAU | 2 |
| XAV | 1 | XAd | 1 |
| XAn | 1 | XB | 1 |
| XB- | 7 | XBA | 1 |
| XBC | 2 | XBE | 2 |
| XBI | 1 | XBL | 2 |
| XBM | 2 | XBN | 1 |
| XBO | 1 | XBP | 1 |
| XBR | 3 | XBT | 1 |
| XBX | 2 | XBa | 2 |
| XBi | 3 | XBo | 1 |
| XC | 1 | XC- | 1 |
| XC2 | 1 | XCA | 2 |
| XCB | 1 | XCC | 1 |
| XCD | 1 | XCE | 1 |
| XCF | 2 | XCH | 1 |
| XCI | 1 | XCL | 3 |
| XCO | 2 | XCP | 1 |
| XCR | 2 | XCX | 1 |
| XCh | 2 | XCi | 2 |
| XD | 2 | XD2 | 1 |
| XD4 | 1 | XD5 | 3 |
| XD6 | 1 | XD7 | 1 |
| XDA | 1 | XDC | 3 |
| XDE | 1 | XDF | 1 |
| XDH | 2 | XDI | 1 |
| XDK | 2 | XDM | 2 |
| XDO | 1 | XDR | 2 |
| XDS | 1 | XDX | 1 |
| XDa | 1 | XDo | 2 |
| XDr | 1 | XDu | 1 |
| XE8 | 1 | XEA | 8 |
| XEB | 7 | XEC | 7 |
| XED | 6 | XEE | 6 |
| XEF | 5 | XEG | 4 |
| XEH | 4 | XEI | 3 |
| XEJ | 4 | XEK | 2 |
| XEL | 4 | XEM | 1 |
| XEN | 6 | XEO | 1 |
| XEP | 9 | XEQ | 5 |
| XER | 15 | XES | 7 |
| XET | 13 | XEU | 2 |
| XEV | 3 | XEW | 10 |
| XEX | 4 | XEY | 2 |
| XEZ | 2 | XEm | 2 |
| XEp | 1 | XEv | 1 |
| XF | 1 | XF | 1 |
| XF- | 5 | XF8 | 1 |
| XFA | 1 | XFE | 1 |
| XFI | 1 | XFL | 3 |
| XFM | 2 | XFN | 1 |
| XFS | 1 | XFV | 1 |
| XFX | 1 | XFa | 1 |
| XFi | 2 | XFo | 3 |
| XFr | 3 | XG | 1 |
| XG | 1 | XG- | 1 |
| XG3 | 1 | XGA | 3 |
| XGE | 1 | XGG | 1 |
| XGM | 1 | XGP | 1 |
| XGR | 1 | XGa | 1 |
| XHA | 15 | XHB | 5 |
| XHC | 9 | XHD | 11 |
| XHE | 6 | XHF | 12 |
| XHG | 7 | XHH | 3 |
| XHI | 8 | XHJ | 7 |
| XHL | 6 | XHM | 11 |
| XHN | 14 | XHO | 6 |
| XHP | 7 | XHR | 8 |
| XHS | 3 | XHT | 18 |
| XHU | 14 | XHV | 3 |
| XHW | 4 | XHX | 2 |
| XHY | 1 | XHZ | 2 |
| XI | 6 | XIA | 1 |
| XIC | 2 | XII | 19 |
| XIM | 1 | XIN | 1 |
| XIO | 1 | XIR | 1 |
| XIS | 1 | XIT | 2 |
| XIV | 5 | XIX | 3 |
| XIm | 1 | XIn | 1 |
| XJ | 1 | XJA | 1 |
| XK | 1 | XK | 1 |
| XKM | 1 | XKO | 1 |
| XKR | 1 | XL | 1 |
| XL | 10 | XLA | 2 |
| XLB | 1 | XLC | 1 |
| XLD | 1 | XLE | 1 |
| XLH | 1 | XLI | 2 |
| XLM | 1 | XLP | 1 |
| XLR | 3 | XLS | 1 |
| XLi | 3 | XM | 27 |
| XM- | 1 | XM2 | 3 |
| XM3 | 3 | XM5 | 1 |
| XM8 | 1 | XM9 | 1 |
| XMA | 6 | XMB | 2 |
| XMD | 4 | XMI | 3 |
| XMK | 2 | XML | 24 |
| XMM | 3 | XMO | 2 |
| XMP | 3 | XMR | 2 |
| XMS | 1 | XMT | 1 |
| XMU | 2 | XMX | 1 |
| XMa | 2 | XMi | 1 |
| XN | 1 | XNA | 1 |
| XNN | 1 | XNO | 1 |
| XNS | 1 | XNU | 2 |
| XNa | 1 | XO | 1 |
| XO | 1 | XO- | 5 |
| XOF | 1 | XOM | 1 |
| XOO | 2 | XOP | 1 |
| XOR | 3 | XOS | 2 |
| XOT | 2 | XOX | 1 |
| XOb | 1 | XOr | 1 |
| XP | 1 | XP- | 1 |
| XP4 | 1 | XP8 | 1 |
| XPA | 1 | XPB | 2 |
| XPC | 4 | XPD | 3 |
| XPE | 2 | XPG | 1 |
| XPI | 1 | XPL | 3 |
| XPM | 2 | XPN | 3 |
| XPO | 5 | XPP | 1 |
| XPQ | 1 | XPR | 1 |
| XPS | 1 | XPT | 2 |
| XPV | 1 | XPa | 2 |
| XPe | 1 | XPh | 1 |
| XPi | 1 | XPl | 1 |
| XPo | 2 | XPr | 2 |
| XPu | 1 | XQF | 1 |
| XQU | 1 | XQu | 1 |
| XR | 1 | XR | 1 |
| XR- | 3 | XRC | 8 |
| XRD | 1 | XRN | 2 |
| XRS | 1 | XRT | 1 |
| XRe | 1 | XRu | 3 |
| XS | 1 | XS | 5 |
| XS4 | 1 | XSA | 1 |
| XSB | 2 | XSI | 2 |
| XSL | 2 | XSP | 3 |
| XSS | 2 | XSc | 2 |
| XSh | 2 | XSt | 1 |
| XT | 1 | XT | 1 |
| XTA | 1 | XTC | 2 |
| XTE | 4 | XTF | 1 |
| XTI | 1 | XTM | 1 |
| XTN | 2 | XTP | 1 |
| XTR | 2 | XTS | 2 |
| XTX | 1 | XTa | 1 |
| XTe | 1 | XTr | 1 |
| XU | 1 | XUI | 1 |
| XUL | 2 | XUV | 1 |
| XUp | 1 | XV | 1 |
| XV | 8 | XV- | 1 |
| XV1 | 1 | XVI | 11 |
| XVR | 1 | XVT | 1 |
| XVi | 2 | XWA | 1 |
| XWE | 1 | XWP | 1 |
| XWi | 3 | XX | 1 |
| XX | 10 | XX/ | 1 |
| XXI | 13 | XXL | 7 |
| XXT | 1 | XXV | 5 |
| XXX | 17 | XXY | 2 |
| XY | 1 | XY | 2 |
| XYL | 2 | XYZ | 5 |
| XYp | 1 | Xab | 9 |
| Xac | 4 | Xad | 1 |
| Xaf | 1 | Xag | 7 |
| Xai | 9 | Xak | 7 |
| Xal | 16 | Xam | 7 |
| Xan | 155 | Xao | 1 |
| Xap | 18 | Xaq | 2 |
| Xar | 21 | Xas | 6 |
| Xat | 2 | Xav | 140 |
| Xaw | 5 | Xax | 5 |
| Xay | 3 | Xba | 2 |
| Xbl | 2 | Xbo | 13 |
| Xca | 10 | Xce | 5 |
| Xch | 5 | Xco | 6 |
| Xdi | 1 | Xdm | 1 |
| Xdo | 1 | Xdr | 2 |
| Xe | 1 | XeT | 1 |
| Xeb | 4 | Xec | 1 |
| Xed | 1 | Xee | 2 |
| Xeg | 1 | Xei | 1 |
| Xek | 3 | Xel | 11 |
| Xem | 3 | Xen | 253 |
| Xeo | 2 | Xep | 1 |
| Xer | 82 | Xes | 8 |
| Xet | 3 | Xeu | 1 |
| Xev | 10 | Xew | 1 |
| Xex | 2 | Xez | 2 |
| Xfc | 1 | Xfi | 3 |
| Xfm | 6 | Xft | 1 |
| Xgh | 1 | Xgl | 1 |
| Xgr | 3 | Xgħ | 1 |
| Xh | 2 | Xha | 4 |
| Xhe | 10 | Xhi | 1 |
| Xho | 3 | Xht | 1 |
| Xhu | 2 | Xi | 1 |
| Xi | 47 | Xi' | 5 |
| Xi- | 2 | XiR | 1 |
| Xia | 182 | Xib | 4 |
| Xic | 13 | Xid | 3 |
| Xie | 41 | Xif | 2 |
| Xih | 5 | Xik | 2 |
| Xil | 14 | Xim | 14 |
| Xin | 93 | Xio | 22 |
| Xip | 33 | Xiq | 2 |
| Xir | 12 | Xis | 27 |
| Xit | 7 | Xiu | 15 |
| Xiv | 2 | Xix | 15 |
| Xiy | 2 | Xiz | 3 |
| Xià | 1 | Xiè | 1 |
| Xki | 1 | Xle | 2 |
| Xli | 2 | Xls | 1 |
| Xlt | 1 | Xma | 8 |
| Xmi | 2 | Xml | 4 |
| Xmo | 1 | Xmu | 2 |
| XnG | 1 | XnV | 1 |
| Xna | 1 | Xnc | 1 |
| Xne | 3 | Xnk | 1 |
| Xno | 1 | Xoa | 1 |
| Xob | 3 | Xoc | 12 |
| Xod | 2 | Xog | 1 |
| Xoh | 2 | Xoi | 3 |
| Xok | 2 | Xol | 11 |
| Xom | 6 | Xon | 9 |
| Xoo | 3 | Xor | 12 |
| Xos | 4 | Xou | 3 |
| Xov | 2 | Xoy | 1 |
| Xp | 1 | Xpa | 3 |
| Xpd | 1 | Xpe | 1 |
| Xpl | 14 | Xpo | 1 |
| Xpr | 12 | Xpu | 3 |
| Xq2 | 1 | Xqu | 1 |
| XrM | 1 | Xra | 1 |
| Xri | 1 | Xrm | 1 |
| Xro | 2 | Xry | 1 |
| Xs3 | 1 | Xsa | 1 |
| Xsc | 4 | Xse | 1 |
| Xsg | 1 | Xsj | 1 |
| Xsl | 2 | Xsn | 1 |
| Xst | 2 | Xsu | 2 |
| Xta | 7 | Xte | 4 |
| Xto | 1 | Xtr | 27 |
| Xtu | 2 | Xu | 1 |
| Xu | 84 | Xua | 23 |
| Xub | 1 | Xuc | 5 |
| Xud | 1 | Xue | 29 |
| Xui | 1 | Xuj | 4 |
| Xul | 6 | Xum | 1 |
| Xun | 15 | Xuo | 1 |
| Xup | 1 | Xur | 3 |
| Xut | 5 | Xux | 5 |
| Xuy | 3 | Xuz | 2 |
| Xuâ | 1 | Xva | 1 |
| Xvf | 1 | Xvi | 1 |
| Xwr | 1 | Xxe | 1 |
| Xxg | 1 | Xxx | 1 |
| XyM | 1 | XyW | 1 |
| Xya | 1 | Xyb | 3 |
| Xyd | 1 | Xye | 2 |
| Xyg | 1 | Xyk | 2 |
| Xyl | 79 | Xym | 2 |
| Xyn | 5 | Xyp | 2 |
| Xyr | 8 | Xys | 14 |
| Xyz | 3 | Xza | 1 |
| Xzi | 2 | Xàt | 1 |
| Xäl | 1 | Xèo | 1 |
| Xéd | 1 | Xél | 1 |
| Xêg | 1 | Xên | 1 |
| Xêx | 1 | Xír | 1 |
| Xóc | 2 | Xôi | 1 |
| Xö | 1 | Xös | 1 |
| Xüm | 1 | X̱w | 2 |
| X̲á | 1 | x | 1 |
| x-a | 1 | x26 | 1 |
| x86 | 3 | x87 | 1 |
| xAC | 1 | xAp | 1 |
| xB | 1 | xBa | 1 |
| xCB | 1 | xCa | 1 |
| xD | 1 | xDE | 1 |
| xDI | 1 | xDN | 2 |
| xHa | 1 | xMa | 1 |
| xMu | 1 | xRe | 1 |
| xSc | 1 | xTu | 1 |
| xUn | 1 | xVR | 1 |
| xXx | 2 | xaj | 1 |
| xar | 1 | xaw | 1 |
| xba | 1 | xbi | 1 |
| xde | 1 | xey | 1 |
| xfe | 1 | xfm | 1 |
| xin | 4 | xkc | 1 |
| xko | 1 | xmo | 1 |
| xmx | 1 | xrd | 2 |
| xte | 1 | xv | 1 |
| xvY | 1 | xwa | 1 |
| xwd | 1 | xyl | 1 |
| xzg | 1 |